Fire-Rated Door Louvres: How to Balance Ventilation and Fire Safety
In buildings where ventilation and fire protection both matter, fire-rated door louvres offer a practical, safe and compliant solution. When air moves through a door opening, it improves indoor air quality and helps control moisture, but regular louvres aren’t suitable for fire doors. FBLS Fire Block Louvres are suitable for steel fire doors and provide up to 240 minutes of fire integrity.
Ventilation Matters
Buildings that don’t breathe properly can become health hazards. Poor indoor air quality, from elevated CO2 to VOCs emitted by everyday materials, contributes to headaches, respiratory irritation and dips in concentration and productivity. Inadequate ventilation is a particular concern in offices, classrooms, plant rooms and other enclosed spaces where people spend long periods of time.
Door louvres are a straightforward, effective way to improve air circulation, helping to reduce moisture, dispersing pollutants and supporting temperature control. But where air can pass, so can smoke and flame. That’s why a conventional louvre is not suitable for fire-rated doors.
Iain Banks, Product Marketing Manager, commented:
‘When you need airflow and fire protection in the same opening, a fire block louvre is the sensible and compliant option for your steel fire doors. Metal louvres will provide the ventilation you need in offices, classrooms, plant rooms, stores and other areas, but the FBLS Fire Block Louvre System assures that ventilation doesn’t become a route for smoke or fire.’
Why Fire-Rated Door Louvres
The ideal solution for both factory-fitting and retrofit applications, the FBLS Fire Block Louvre System accommodates door thicknesses from 29 mm upwards and provides a 40% free area for effective airflow. At the centre of the FBLS is an intumescent fire block, which, under high temperatures, expands to seal the opening, choking off the passage of fire and cold smoke, while the louvre remains unobtrusive in everyday use. The result is a practical, compliant solution for fire-rated doors that also require ventilation.
Iain continues: ‘Our fire block louvre systems are expertly manufactured and are suitable for steel fire doors, providing up to 240 minutes of fire integrity. We have over 20 standard sizes available from stock and any size available to order from a minimum cut-out of 152 x 152mm.’
Discover more about the FBLS Fire Block Louvre System or call us on 01785 282 910.
Frequently Asked Questions
What is a fire-rated door louvre? It’s a vented panel designed for fire doors that allows air to pass but blocks smoke and flames during a fire.
How does the FBLS Fire Block Louvre System work? The system is an intumescent fire door louvre. Its material expands when exposed to heat, sealing the louvre and preventing fire and smoke spread.
Can fire door louvres affect the fire rating of a door? An intumescent fire door louvre like the FBLS preserves the door’s fire integrity.
What sizes are available for the FBLS system? Over 20 standard sizes from stock and custom sizes starting at 152 x 152mm.
Are fire block louvres suitable for retrofitting existing fire doors? Yes, the FBLS works for both new builds and retrofit applications on steel fire doors.