ABOUT
Durasub Passive Air Flow
Fire Door Range 

The Durasub Passive Air Flow Fire Door range offers a level of flexibility rarely found in fire-rated steel doors. Each doorset is purpose-built to meet exact project requirements, with tested solutions available for openings up to 5 m high and 6.8 m wide. This makes the Durasub Passive Air Flow range ideal for complex or non-standard openings where fire performance cannot be compromised. 

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Available in single and double-leaf configurations, Durasub Passive Air Flow Fire Doors are suitable for both internal and external applications. 

The doors are constructed from a high-strength composite panel of fibre-reinforced cement mechanically bonded to punched steel sheets on both outer faces. This construction delivers excellent impact resistance, durability, and long-term reliability in demanding environments. 

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Durasub Passive Air Flow Fire Doors incorporate intumescent air transfer louvres that allow continuous airflow under normal operating conditions while maintaining fire protection performance.

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The intumescent air transfer louvres can be installed within the door leaves, above the door, or as a combination of both configurations, with up to three louvres permitted per door leaf.

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In the event of a fire, the intumescent material expands automatically to seal the ventilation openings, maintaining the fire-resistance integrity of the door assembly and preventing the passage of flames and hot gases through the ventilation path.