Intumescent Vents & Letterboxes
Fire-Rated Intumescent Vents and Letterboxes
Control the spread of fire, smoke, and hot gases with a reliable range of intumescent door vents, letterboxes, and pipe collars. These essential passive fire protection components are designed to support compartmentation, keeping escape routes clear and helping to protect property and life.
This range includes intumescent air vents for fire doors, intumescent door grille cover plates, letter plates, and pipe collars. All are engineered to react quickly when exposed to heat, sealing gaps and limiting fire spread through doors, walls, and service penetrations.
Why Choose Intumescent Door Hardware?
Intumescent vents and fire-rated letterboxes can be seen as secondary passive fire safety products. However, they are critical to a compliant fire door assembly. Designed for life safety and regulatory compliance, these products activate in high temperatures, expanding to close off air transfer paths and restrict the development of fire.
Every intumescent fire grille, pipe collar, or letterbox helps maintain compartment integrity by stopping airflow that could feed a fire or allow smoke to migrate between rooms and spaces. Compliant fire door ironmongery is a non-negotiable part of effective fire safety planning.
Intumescent Air Transfer Grilles for Fire Doors
When ventilation is required through a fire door, a standard louvre or slot vent is not sufficient. Intumescent air transfer grilles offer a tested solution, with the intumescent element swelling in the presence of heat to block airflow.
Key benefits:
- Tested to relevant fire ratings for 30 and 60 minute fire rated doors
- Available in standard sizes and different free air flow values
- Options for 44mm and 54mm doors
- Compatible intumescent vent covers
- Flexible installation to suit timber doors and compartment walls
These vents meet building regulations for fire-resisting doors while allowing for necessary airflow under normal conditions. They have been fire tested to BS476 part 20/22:1987. Check that the door has been tested for an aperture to accept an intumescent transfer grille.
Fire-rated intumescent air transfer grilles are for use on fire-only doors. If you require ventilation for fire and smoke doors, you will need to install a smoke damper. Contact our knowledgeable team today for guidance on selecting the right product for your facility.
Intumescent Letterboxes
Fire-rated intumescent letterboxes are a must on flat entrance doors and other residential units where mail openings can compromise fire resistance. Unlike standard letter plates, an intumescent letterbox contains an expanding lining of intumescent material that seals the aperture in the event of fire.
Options include:
- Intumescent letterbox brass, black, grey finishes, and more to match existing door hardware
- Suitable for timber and composite doors up to 54mm thick
- TS 008 tested models to protect against fishing and manipulation
- PAS 24 units for enhanced security performance
- Intumescent letter plate fire-rated models tested to BS 476 Part 22 and BS EN 1634
- Integrated draught seals and brush strips for everyday efficiency
- Letter plates with acoustic and smoke rating
Intumescent Pipe Collars
Where services penetrate fire compartments, intumescent protection is critical. Intumescent pipe collars are installed around pipes where they enter walls or floors. They prevent the spread of fire by expanding rapidly, collapsing the pipe, and sealing the gap.
Key features:
- Stainless steel outer casing prevents outward expansion
- High-performance intumescent core crushes plastic pipework
- Suitable for walls and floor penetrations
- Tested to BS 476 part 20
- 4 hours fire rated
- Horizontal or vertical application
These ancillary items are vital components of fire safety that support life-saving compartmentation.
Passive Fire Protection Where It Matters Most
Browse our stock selection of fire-rated intumescent vents, letterboxes, and pipe collars today. With fast delivery and trusted brands in stock, you’ll find the right solution for your project. Whether you're upgrading existing doors or managing a new installation, we have a compliant fire door intumescent protection solution.
Protect your built environment. Shop intumescent fire door vents and accessories today.
