Aluminium Window Security Restrictors: Fall Prevention, Ventilation and Compliance Coordination

An openable window is one of the few parts of a building that invites its occupants to defeat it. A door has a threshold and a duty; a window has a handle and no supervision. The restrictor exists because of that difference. It is a small piece of hardware with a large job: hold an opening to a limit that someone else has decided is tolerable, survive years of use by people who did not read the manual, and still allow the room behind it to breathe.

What follows treats the restrictor as part of a system rather than a catalogue item. It examines what the device is asked to do and what it is not, why an opening limit belongs to the project rather than the product, how fall prevention and child safety are actually delivered, what a restricted opening does to ventilation intent, why emergency release and security pull in opposite directions, how hardware compatibility determines whether a restrictor works at all, how the common window types behave, and how maintenance, cleaning, glazing, Australian compliance settings and New Zealand references fit around it. Specific opening dimensions, prices, thermal and acoustic figures and performance claims are deliberately omitted, because those values are established for a particular window on a particular project and cannot be carried across a product category.

What a Security Restrictor Is Asked to Do

A Limit, Not a Lock

A restrictor is a travel limiter. It allows a sash or a sliding panel to move within a defined range and then stops it. A lock, by contrast, prevents movement altogether, and a lock is judged by whether it keeps someone out. The two functions are often confused in conversation and occasionally in procurement, which is why a window can end up with a device that secures the opening but does not limit it, or one that limits the opening but offers no resistance to forcing.

Because the device is a limiter, its performance is bound up with the frame it is fixed to. A restrictor that is strong in isolation but screwed into a thin-walled aluminium profile, or into a profile whose internal web is not where the installer assumed it to be, has the strength of its fixings rather than the strength of its body. This is the first place where coordination matters more than selection.

Three Devices That Look Similar

Alongside the restrictor sit the friction stay and the window stay. A friction stay holds a sash at whatever angle the user leaves it, using friction rather than a positive stop, so it resists movement but does not define a hard limit. A stay or casement stay is a rigid arm that props the sash and typically offers a limited number of positions. Neither is a substitute for a restrictor where a defined maximum opening is required, and a restrictor is not a substitute for a stay where the sash must hold itself open.

At the other end of the range sit security screens, grilles and guard assemblies. These are barriers. A restrictor is not a barrier, and treating one as the other is the most common conceptual error in this area. A barrier is designed to stop a body passing through an opening. A restrictor is designed to keep the opening small enough that the question of passing through does not arise in ordinary use.

Opening Limits Belong to the Project

Where the Limit Comes From

The distance a window is permitted to open is a project decision, not a product attribute. It can be set by the applicable building code provisions for the building class, by the fire and life safety strategy, by the requirements of an early childhood centre or a school, by a client design standard for social housing or aged care, by an insurer, by a facilities management policy, or by a combination of all of these. The same window type on two projects can therefore carry two different limits with no change to the hardware family at all.

That is why a supplier who quotes a single opening dimension as “the compliant limit” is answering a question that was never theirs to answer. The correct sequence is to establish the applicable limit from the project requirements, then select or adjust hardware to achieve it, then verify the achieved limit on the installed window rather than on a data sheet.

Why Suppliers Cannot Publish One Answer

Aluminium window systems are configured. Frame depths, sash weights, hinge positions, gasket lines, glazing thicknesses and reveal conditions all vary between projects, and each of those variables changes what a restrictor can hold and what a sash will do when it reaches its stop. A published figure that held for one configuration would be misapplied on the next. What a responsible supplier publishes instead is the range of adjustment the device offers, the fixing arrangement it expects, and the conditions under which it should not be used.

Designers should read a restrictor data sheet as a set of constraints rather than a set of guarantees. The useful information is the mounting interface, the travel range, whether the device is fixed or detented, whether it is releasable, and what the manufacturer says about maintenance and replacement. The performance of the finished opening is established by inspection on site.

Documenting the Limit

Because the limit is a project requirement, it has to be written down somewhere that survives handover. A window schedule that records the required limit per window type, the device selected to achieve it, and the reason the limit applies, gives the installer, the certifier, the building surveyor and the maintenance contractor a single reference. Without that record, the limit exists only in the memory of whoever attended the coordination meeting, and it will not survive the first replacement of a broken sash.

Fall Prevention and the Load Path

What the Device Can Resist

A restrictor works by transferring load from a moving sash into a fixed frame at a point. The load may come from a person leaning on the open sash, from wind catching it, or from the momentum of a sash swung open too quickly. The device’s ability to resist that load depends on the strength of its body, the strength of its fixings, the local strength of the aluminium profile at the fixing point, and the stiffness of the frame into which the load is delivered.

The weak link is usually the profile. Aluminium window sections are designed to carry glass and wind pressure, not necessarily to receive a concentrated point load from a small bracket. Where a restrictor is required to do structural work, the fixing should be located where the manufacturer intends, using the fasteners the manufacturer specifies, and reinforced where the profile is thin or where the section is a hollow with no internal web at that position.

What It Cannot Replace

A restrictor is not a guard, a balustrade or a barrier, and it does not convert a window into any of those things. Where the building code, the project brief or a risk assessment requires a barrier to prevent a fall from an opening, the barrier is a separate element with its own structural and dimensional requirements, and the restrictor does not discharge that obligation. The distinction matters most in apartments, student accommodation, hotels and any building where a window sill sits low relative to the floor.

It also matters in existing buildings, where a refurbishment may change the use of a room or the height of a floor finish and thereby change what the opening is expected to do. A window that was acceptable for a storage area may not be acceptable for a bedroom, even though the hardware has not moved.

The Habit Layer

Hardware only works while it is in the condition it was installed in. A restrictor that has been disconnected to allow furniture to pass through the opening, or unscrewed by a resident who wanted more air, provides no fall prevention at all, and no amount of specification effort can compensate. This is why fall prevention in occupied buildings is a management system as much as a hardware system: inspection, records, a process for authorized release, and a route for residents to report a device that has been altered.

Child Safety

Supervision and Furniture

Children climb. The most effective child safety measure around an openable window is not a device but the absence of anything to climb on: beds, desks, toy boxes and chairs placed under a sill convert a limited opening into an accessible one. Designers who cannot control furniture placement can at least avoid designing deep sills that invite sitting, and can locate operable sashes where they are harder to reach from the floor.

Supervision remains the primary control in dwellings, and no hardware claim should be read as a substitute for it. The value of a restrictor in a home is that it removes the easy path to a fully open window during the years when a child is mobile, curious and unable to judge height.

Settings That Get Changed

A releasable restrictor is a compromise between safety and access, and the compromise is only as good as the release discipline around it. In a family home the release is usually a key or a tool held by an adult. In a school, an early childhood centre or a supported accommodation setting, the release must be controlled by staff and recorded, because a device that any occupant can release provides no limit at all during the hours when supervision is thin.

Where a project requires both child safety and rapid egress, the release method should be chosen with the building’s emergency procedures in mind rather than by default. A keyed release that staff cannot find during a drill is a design fault, not a user error.

Ventilation and the Restricted Opening

Air Change Versus Purge

A restricted opening is a fraction of a full opening, so the airflow it delivers is a fraction of the design intent unless the window schedule was adjusted to compensate. Designers who specify restrictors on every operable window while retaining a ventilation strategy based on full openings are, in effect, reducing the building’s ventilation capacity without saying so. The honest approach is to decide whether the strategy depends on background ventilation through small openings or on intermittent purge through large ones, and then to place restrictors accordingly.

Background ventilation suits rooms with a steady, low demand and a ceiling or wall vent path. Purge ventilation suits kitchens, bathrooms, meeting rooms and any space where a short burst of air is expected to clear heat or odour. Restricting a purge window without providing another purge path usually produces a room that is neither ventilated nor comfortable, followed by a resident who defeats the hardware.

Night Purge and Weather

Night purge relies on a small opening left in place overnight, which is precisely the condition a restrictor creates. It also relies on the opening being weatherproof in the prevailing wind and rain, which is a separate question from the restrictor and belongs to the window’s weather performance and the detailing around it. A restricted opening that admits driven rain will be closed by the occupant, and the ventilation benefit disappears.

Where night purge is part of the mechanical strategy, the restrictor setting and the control sequence should be coordinated so the opening position assumed by the designer is the position the hardware actually allows. This is the sort of interface that is easy to miss because it sits between two consultants and one subcontractor.

Coordinating with Mechanical Services

Mechanical ventilation, operable windows and restrictors interact. A room with mechanical supply and a restricted opening may be pressurized or depressurized relative to design, changing infiltration and door behaviour. A room relying on cross ventilation through two restricted openings may deliver far less than the designer’s assumption. The coordination point is the ventilation schedule, where operable area, restrictor setting and mechanical provision should be reconciled before the windows are ordered.

Emergency Release

Two Duties in Tension

Security and emergency escape pull against each other. The more resistant a restrictor is to unauthorized release, the more deliberate the release action becomes, and the longer it takes under stress. There is no universally correct balance. In a dwelling, a tool-operated or keyed release held by an adult is often appropriate. In a bedroom of a rented apartment, the release must be operable by the occupant in an emergency without a search for a key. In a commercial building, the fire and life safety strategy governs, and the window may not be an escape route at all.

The design response is to decide, per window and per room, whether the opening is an escape path, a ventilation opening, or both, and then to select the release method that satisfies both duties for that specific case. That decision belongs in the documentation, not in a verbal instruction to the installer.

Release Methods and Records

Release methods fall into a few families: keyed release, tool release, push-and-hold mechanisms, and devices that release automatically under load. Each has a maintenance consequence. Keyed releases lose keys. Tool releases lose tools. Push-and-hold mechanisms depend on a spring that ages. Automatic release devices depend on a mechanism that must be tested. Whatever the family, the handover pack should record the release method, the location of any key or tool, the procedure for authorized release, and the frequency of inspection.

Egress, Access and Doors

Where a window forms part of an escape route, the clear opening is governed by the egress provisions applicable to the building, not by the restrictor manufacturer’s travel range. A restrictor that holds an opening below the required clear dimension for egress is a non-compliance even if every other aspect of the installation is correct. This is a coordination item between the window schedule and the fire strategy, and it should be resolved before the hardware is ordered.

Hardware Compatibility

Frame and Sash Interfaces

Restrictors are mounted across a moving joint, which means they must accommodate the geometry of that joint through its full travel. On a casement or awning the joint rotates, so the device must tolerate an arc. On a slider the joint translates, so the device must tolerate a straight track. On a double-hung the joint does both, in opposite directions on each sash. A device designed for one motion does not adapt to another by being fitted harder.

The mounting surface also matters. Aluminium profiles often present a narrow face, a glazing bead, or a cover cap that is not structural. Fixing into a bead or a clip-on cover will look neat on the day of installation and fail within a season of use. The manufacturer’s intended mounting position exists for a reason, and deviating from it shifts the load into components that were never designed for it.

Friction Stays, Hinges and Stays

Where a sash is carried on friction stays, the restrictor must not fight the stay. If the stay is adjusted to hold the sash open and the restrictor limits travel before that position, the user experiences a window that will not stay where it is put, and the usual response is to disconnect one of the two devices. The correct approach is to select a stay whose travel range sits inside the required limit, or to select a restrictor whose limit matches the useful part of the stay’s range.

Hinge selection matters on heavy sashes. A large double-glazed casement imposes a continuous load on its hinges and a point load on its restrictor when it reaches the stop. The heavier the sash, the more important it is that the stop is reached gently, which in practice means the restrictor should be positioned to arrest travel before the sash gains momentum rather than at the end of a full swing.

Retrofit Reality

Retrofitting restrictors to existing windows is a different task from specifying them on new ones. The frame may be a discontinued profile, the sash may have sagged, the gaskets may be compressed, and the fixing points that the manufacturer intended may not exist on that section. A retrofit survey should record the profile, the sash weight and dimensions, the existing hardware, the condition of the frame, and the achievable fixing positions before any device is ordered.

Retrofit is also where the difference between a limit and a barrier becomes practically important. If the existing window has a low sill and the room use has changed, a restrictor may not be the right response at all, and a barrier or a fixed glazing solution may be the correct one.

Finishes and Corrosion

Restrictor bodies, arms and fasteners are exposed to the same environment as the window, and often to more of it because they sit in a pocket where water and dust collect. In coastal or industrial locations, dissimilar metals in contact will corrode, and the fastener will usually go first. Specification should keep the device’s finish consistent with the window finish and with the exposure category of the project, and installation should avoid trapping water against the device.

Window Types and How Each Is Restricted

Awning and Casement Windows

Awning and casement sashes rotate about a horizontal or vertical axis, so the restrictor limits angular travel. The geometry means the effective clear opening changes non-linearly with angle: a small angular change near the closed position produces little clear opening, while the same change near the fully open position produces much more. This is why the achieved limit must be measured as a clear opening on the installed window rather than inferred from an angle.

Outward-opening sashes add wind exposure. A gust can drive an unrestrained sash against its stop, and repeated impact is what wears restrictors and distorts arms. Where the window is exposed, the restrictor should be robust enough for that duty and inspected for fatigue.

Sliding Windows

On a slider, the restrictor limits linear travel, usually by a stop block, a cable or a track-mounted device. Sliders are often the hardest to restrict discreetly, because the sash travels in a track that is visible and accessible from inside. A device that can be flicked out of engagement with a finger is not a limit, and sliders in rental or public housing are where this becomes apparent quickly.

Sliders also carry a security dimension that hinged windows do not. The meeting stile, the lock and the anti-lift provision interact with any restrictor, and a restrictor fitted in a way that prevents the sash from engaging its lock is worse than no restrictor.

Double-Hung Windows

Double-hung windows have two sashes moving in opposite directions, so a single device usually limits only the sash it is fitted to. If both sashes must be limited, both need attention, and the upper sash is often forgotten because it is harder to reach. The balance mechanism also matters: a sash with a failed spring or a slack cord will not stay where it is placed, and the restrictor will be blamed for a fault that belongs to the balance.

Tilt-Turn and Louvre Windows

Tilt-turn windows have two modes, and the limit that applies in the turn mode may not be the limit that applies in the tilt mode. The hardware sequence, the handle position and the restrictor must be designed together, because a restrictor that blocks the turn mode also blocks cleaning access from inside. Louvre windows are a special case: the blades form the opening, and restricting a louvre usually means limiting the blade angle or limiting the number of blades that can be opened, which changes both ventilation and the ability to clean.

Fixed and Composite Openings

Fixed glazing has no opening to restrict, but it sits beside openings that do, and the visual and structural coordination still matters. A composite unit with a fixed pane and an operable sash is one frame with two behaviours, and the restrictor must be detailed so it does not interfere with the fixed pane’s glazing beads or with the drainage path in the frame.

Maintenance

The Inspection Cycle

Restrictors are mechanical devices with moving parts, and they need inspection. A practical cycle covers the first inspection after occupancy, when installation errors and user interference are most likely to be found, then periodic inspection at a frequency set by the building’s use and exposure, then inspection after any event that may have loaded the device, such as a wind storm, an attempted break-in or a report of a sash that will not close.

The inspection itself is simple: confirm the device is present, confirm it is the specified type, confirm the fixings are sound, confirm the achieved opening matches the documented limit, confirm the release method works, and record the result. The value is in the record, because a maintenance system without records cannot demonstrate that the control is in place.

Common Failures

The failures repeat. Fasteners loosen or pull out of thin profiles. Arms bend after a sash is forced. Springs weaken. Keys are lost. Devices are removed and not replaced. Cover caps are refitted over fixings and hide the fact that the fixing has gone. Gaskets compress and the sash sits differently, changing the achieved opening. None of these are exotic, and all of them are visible to an inspector who knows what to look for.

Records and Replacement

Replacement parts should match the original specification, because a substitute with a different travel range silently changes the opening limit. Where the original device is discontinued, the replacement should be selected against the documented limit and the documented fixing arrangement, and the change should be recorded. A building that has been through three rounds of ad hoc replacement often has three different limits on the same elevation.

Cleaning and Access

Cleaning From Inside

A restrictor reduces the opening available for cleaning, and on upper floors the outside face of the glass may only be reachable through that opening. This is a design conflict that should be resolved early: either the building provides an external access system, or the window provides a cleaning position that the restrictor permits, or the glazing is specified so that cleaning is less frequent. Discovering the conflict after handover usually results in someone defeating the restrictor.

Tilt-turn and reversible windows solve the problem by design, which is one reason they are common in apartment buildings. Awning and casement windows on upper floors generally need either an external access strategy or a restrictor that permits a defined cleaning position, and that position should be included in the documented limit.

The Maintenance Paradox

The same opening that allows cleaning also allows access for maintenance of the restrictor itself, and a device that cannot be reached cannot be inspected. Where restrictors are fitted to high sashes, the inspection method should be planned: access equipment, a removable bead, or a device positioned so it can be seen and tested from inside. A control that cannot be verified is difficult to defend in any later review.

Glazing, Weight and the Opening

Glass Selection and Safety

Glass selection is governed by the glazing standard applicable to the project, which addresses human impact, location within the building, and the consequences of breakage. Where a window is an escape route or sits in a location with a fall risk, the glazing choice and the opening limit interact: a restrictor does not make unsafe glazing safe, and safety glazing does not make an unrestricted opening safe. Both are needed where both risks exist.

Insulating Glass Units

Insulating glass units are heavier than single glazing, and the extra weight is carried by the sash and transmitted to hinges, stays and restrictors. The glazing standard for insulating glass units addresses their manufacture and durability, but the structural consequence for hardware sits with the window system. A sash designed for a lighter unit and later reglazed with a heavier one will show it first at the hinges, then at the restrictor.

Weight and Hinge Duty

Heavy sashes need hardware selected for the duty, and the restrictor is part of that selection. A device selected for the upper end of its manufacturer’s sash mass range should not be used at that extreme on an exposed elevation where wind adds load. Where the duty is uncertain, the conservative choice is a device with margin and a fixing arrangement that spreads load into the frame.

Australian Compliance Coordination

The National Construction Code

The National Construction Code (NCC), maintained by the Australian Building Codes Board (ABCB), sets the performance requirements that a building must satisfy, including those relating to fall prevention, safe movement and the safety of users. The code is performance based, which means it states the outcome and allows more than one route to it. A window restrictor is one possible element in a solution, but it is not named as a deemed-to-satisfy answer for every situation, and it never stands alone where a barrier is required.

Coordination therefore means reading the applicable provisions for the building class and the specific room, checking whether a barrier or a limited opening is the required outcome, and documenting the chosen route. Where an alternative solution is used, the supporting evidence belongs with the approval documentation, not only in the window supplier’s file.

AS 2047 and the Window as an Assembly

AS 2047 covers windows and external glazed doors in buildings and deals with the window as a manufactured assembly. Its relevance here is that it treats the window as a system whose performance is established for a configuration, which is the same logic that applies to restrictors. A restrictor added to a tested window changes the assembly, and the change should be assessed rather than assumed to be neutral.

The practical consequence is that the window schedule, the tested configuration and the restrictor selection should be read together. Where a project changes the hardware after the window is ordered, the change should be recorded and, where the change affects the assembly, reviewed by the responsible designer.

AS 1288, AS 4666 and the Glazing Interface

AS 1288 governs the selection and installation of glass in buildings, and AS 4666 governs insulating glass units. Both sit upstream of the restrictor decision but downstream of nothing: the glass determines the sash weight, the sash weight determines the hardware duty, and the hardware duty determines whether the restrictor is adequate. A coordinated project follows that chain in order rather than selecting the restrictor first and hoping the glazing agrees.

Evidence and Hold Points

Compliance is demonstrated by evidence, and the evidence for a restrictor is modest but specific: the specified device, the documented limit, the installation record, the achieved opening measured on site, and the inspection record. These fit naturally into hold points during construction, before handover and at the first post-occupancy inspection. A project that captures them has a defensible position; one that does not has a building full of hardware and no way to show it was the right hardware.

New Zealand References

Building Code Clauses

In New Zealand, the Building Code sets performance requirements through its clauses, and Clause F4 addresses safety from falling while Clause B1 addresses structure. A window restrictor may contribute to satisfying F4 in some situations, but the clause is concerned with the outcome, and the Acceptable Solutions and guidance published by the Ministry of Business, Innovation and Employment describe routes to that outcome. As in Australia, the restrictor is an element within a solution rather than a solution in itself.

The Building Code also addresses means of escape and the safety of users, so the release method for a restricted opening should be checked against the escape provisions applicable to the building. A restrictor that cannot be released by an occupant who needs to escape is not acceptable, however well it performs its limiting function.

Standards and Verification

NZS 4223 addresses glazing in buildings and applies the same logic as AS 1288: the glass is selected for its location and the consequences of breakage. NZS 3604 addresses timber-framed buildings and the framing into which windows are fixed, which matters for how a restrictor’s load is transferred into the structure. NZS 4211 addresses the performance of windows as manufactured assemblies, so it plays the role that AS 2047 plays in Australia.

Verification in New Zealand follows the same pattern: establish the requirement, select the assembly and the hardware, install to the manufacturer’s instructions, and record the achieved result. Where a building consent requires specific evidence, that evidence should be assembled before the windows are closed in, not reconstructed afterwards.

A Coordination Sequence

Design Stage

At design, the project should establish which openings need a limit, why, and what the limit is derived from; whether any opening is also an escape route; whether the ventilation strategy depends on full openings; whether cleaning access depends on the opening; and whether a barrier is required in addition to or instead of a restrictor. These five questions, answered per window type, prevent most of the problems that appear later.

Procurement and Fabrication

At procurement, the answers become a schedule line: window type, device type, release method, limit, fixing arrangement and finish. The window fabricator should confirm the device suits the profile before the frame is cut, because a restrictor that does not suit the section is discovered at the worst possible moment. Any change to glazing thickness or sash configuration should trigger a review of the hardware duty.

Installation and Handover

At installation, the device should be fitted where the manufacturer intends, with the specified fasteners, and the achieved opening should be measured and recorded. At handover, the building owner should receive the schedule, the device documentation, the release method and key location, the inspection frequency and the record template. That pack is what makes the control survive the first year of occupation.

Frequently Asked Questions

Is a window restrictor the same as a window lock?

No. A lock prevents the window from opening; a restrictor allows it to open only within a set range. Many windows need both, and the two devices are selected for different reasons. Where a window has a lock only, the opening is either shut or fully open, and there is nothing in between.

Can a restrictor be used instead of a balustrade or barrier?

No. A barrier is a structural element with its own requirements, intended to prevent a person passing an edge. A restrictor limits how far a window opens and is not designed or assessed as a barrier. Where a barrier is required, a restrictor does not discharge that requirement.

Who decides how far a window may open?

The project does, guided by the applicable building code provisions, the building class and use, the fire and life safety strategy, the client’s design standard and any insurer or facilities management requirement. The supplier’s role is to provide hardware that can achieve the decided limit, not to set it.

Will restrictors affect ventilation?

Yes, unless the ventilation design accounts for them. A restricted opening passes less air than a full opening, so a strategy based on full openings will underperform. The fix is to decide at design whether the strategy relies on background ventilation or purge, and to place and set restrictors accordingly.

How is emergency release handled?

By deciding, per window and per room, whether the opening is an escape route. If it is, the release must be operable by the occupant in an emergency and the clear opening must satisfy the escape provisions. If it is not, a keyed or tool release may be appropriate. The method, the key location and the release procedure should all be documented at handover.

Can restrictors be retrofitted to existing windows?

Often, but not always. The existing profile, sash condition, hardware and fixing positions determine what is achievable, and a survey should precede any order. Where the room use has changed and a barrier is now required, a restrictor is not the right answer and the options should be reassessed.

How often should restrictors be inspected?

The frequency belongs to the building’s maintenance regime and depends on use and exposure, but the first inspection after occupancy and an inspection after any loading event are always worthwhile. The important part is that the inspection is recorded and that the achieved opening is checked against the documented limit.

Conclusion

A window restrictor is a small device in the middle of a large coordination problem. It sits between the building code and the window schedule, between the ventilation strategy and the cleaning method, between the security requirement and the escape route. When those interfaces are resolved in that order, the hardware is straightforward and the outcome is unremarkable, which is exactly what a safety device should be.

The essentials are consistent across projects. Decide the limit from the project requirements rather than the product data. Confirm the device suits the profile and the sash weight before the frame is fabricated. Measure the achieved opening on the installed window instead of trusting a data sheet. Document the release method and the key location. Inspect, record and replace like for like. Those steps do not depend on a particular brand, a particular window type or a particular city, and they are what separates a restricted opening that works for the life of the building from one that is quietly defeated within a month of handover.

References

Australian Building Codes Board. National Construction Code 2025, Volume One and Volume Two, including the ABCB Housing Provisions. https://ncc.abcb.gov.au
Standards Australia. AS 2047, Windows and external glazed doors in buildings. https://www.standards.org.au
Standards Australia. AS 1288, Glass in buildings – Selection and installation. https://www.standards.org.au
Standards Australia. AS 4666, Insulating glass units. https://www.standards.org.au
Standards Australia. AS 2208, Safety glazing materials in buildings. https://www.standards.org.au
Standards New Zealand. NZS 4223, Glazing in buildings. https://www.standards.govt.nz
Standards New Zealand. NZS 3604, Timber-framed buildings. https://www.standards.govt.nz
Standards New Zealand. NZS 4211, Specification for performance of windows. https://www.standards.govt.nz
Ministry of Business, Innovation and Employment. New Zealand Building Code, Clause F4 Safety from falling, and Clause B1 Structure. https://www.building.govt.nz
Ministry of Business, Innovation and Employment. Building Code compliance guidance and Acceptable Solutions. https://www.building.govt.nz

Aluminium Window Security Restrictors: Fall Prevention, Ventilation and Compliance Coordination