Can Fire Rated Windows Be Openable?
When we think of fire rated glazing, most of us imagine fixed panes of glass designed to act as a passive barrier against fire, smoke, and heat. But what about situations where windows need to be operable for ventilation, comfort, or even egress? The question often asked is: Can fire rated windows be openable?
The short answer is yes – fire rated aluminium windows can be designed to open. However, their design, function, and installation come with specific features, restrictions, and considerations that must be carefully understood.
Features of Fire Rated Openable Windows
Modern fire rated glazing systems have advanced significantly, and today’s solutions offer more flexibility than ever. Openable fire rated windows can be manufactured in a range of configurations, including side-hung, top-hung, or tilt-and-turn styles.
Key features include:
- Fire rated glass: Available in different thicknesses depending on the rating required, ranging typically from 10mm through to 60mm. The thickness is influenced by the length of time the glazing is expected to resist fire, whether it provides integrity-only protection, or integrity and insulation.
- Certified aluminium frames: Frames can be customised to suit architectural preferences while maintaining compliance.
- Hardware: Specialised hinges, closers, and handles are required to ensure the window performs under fire test conditions.
- Glazing options: Windows can be supplied clear for maximum visibility, opaque for privacy, or even with bespoke designs such as company logos or decorative features.
The MB-86EI is used for fabrication of EI30 fire rated openable windows to EN 13501- 2+A1.
So to answer the question, can fire rated windows be openable, they can be openable and non openable.
Benefits and Restrictions
Benefits:
- Ventilation and comfort: Openable windows provide natural airflow, which is particularly important in schools, offices, and residential settings.
- Aesthetic flexibility: Fire rated windows no longer need to compromise the building’s design vision. With bespoke frames and glazing options, they can integrate seamlessly into architectural concepts.
- Customisation: Glass can be etched, tinted, or branded, and frames can be colour-matched or tailored to a design scheme.
Restrictions:
- Regulatory compliance: Not every location is suitable for openable fire-rated glazing. Placement is subject to fire regulations, which dictate size, rating, and permissible opening type.
- Size limitations: There are strict limits on maximum pane size and frame dimensions. These depend on the system tested and certified – larger panes may be possible in fixed windows, but operable ones usually face tighter constraints.
- Opening type restrictions: Certain types of openings (such as outward-opening casements) may not be suitable for all fire-rated applications, depending on test data and certification.
Installation Considerations
The performance of fire rated windows is critically dependent on precise installation. Even the best system will fail if fitted incorrectly.
- Tolerance awareness: Installers must be fully briefed on the required tolerances and fixing methods for the specific system supplied.
- Sealing: Fire rated sealants and gaskets are part of the system and cannot be substituted with standard products. Correct sealing ensures the window maintains its fire-resisting performance.
- Compliance pack: Reputable suppliers provide a full compliance pack, detailing performance data, installation instructions, and certification documents. This ensures that building control and fire officers have the required evidence of conformity.
Additional Safety Features
To meet fire performance standards, openable fire rated windows often incorporate:
- Automatic closers: Windows may be fitted with self-closing devices linked to the fire alarm system, ensuring they shut securely in the event of fire.
- Smoke seals: Intumescent or smoke seals may be required around the frame to limit the spread of smoke.
- Restricted operation: In some cases, windows may be restricted for daily use and only operate in specific scenarios, such as smoke ventilation.
Where They Can and Cannot Be Installed
Suitable Installations
- Compartment walls and facades where ventilation is still required.
- Stairwells and corridors needing natural smoke ventilation.
- Commercial and residential projects where both compliance and comfort are priorities.
Where Not Recommended
- High-risk escape routes where opening windows could compromise compartmentation.
- Areas where incorrect use of an operable window might create hazards in fire conditions.
Pros and Cons
Pros:
- Flexibility in design and ventilation.
- Wide range of glass finishes and frame options.
- Enhances aesthetics while maintaining safety.
Cons:
- More expensive than fixed fire rated glazing.
- Strict size and hardware limitations.
- Precise installation guidelines to be adhered to.
Final Thoughts
Fire rated windows can be openable when the design and installation meet the required specifications, and they work well in settings where natural ventilation matters. However, fixed fire rated windows remain the simpler, lower-cost option where opening isn’t essential, and often meet building regulations without the added cost and complexity of an operable system.
Read our article: Fire Rated Windows Expert Guide: What You Need To Know
Why Choose Aluminium Fire Systems?
At Aluminium Fire Systems are based in Birmingham and supply complete fire safety solutions across the UK:
- Internal & external fire rated windows
- Glass fire doors and partitions
- Fire-tested aluminium framing systems
We’re proud to support architects, builders, and developers across the UK with premium-grade materials and expert installation. Let’s protect your building with innovative fire-safe design.
Ready to find the right fire rated window solution? Visit our product page or contact our team today via phone one (+44) 121 277 4870, or send us a message via the form on our contact page.