The Firesure® Fire Rated Letter Box delivers certified protection and high-quality design for fire-resistant door sets. Independently tested to BS 476 Part 22, this letter box provides up to 40 minutes of fire integrity, making it suitable for FD30 and FD60 rated doors in flats, offices, and commercial premises.
Constructed with a telescopic body lined with Firesure® intumescent material, it expands under heat to seal the aperture and maintain the integrity of the fire door. The durable aluminium flap opens to a minimum of 90°, combining safety with convenience and visual appeal.
Key Features and Benefits
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Certified to BS 476: Part 22 – Provides up to 40 minutes fire protection
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Complies with Building Regulations Class 0 (BS 476)
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Integrated intumescent liner – Expands under fire conditions to block flames and smoke
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Smoke and draught seals – Brush seal around the inner flap for added smoke control
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Durable construction – Telescopic plastic body with extruded aluminium letter plate
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Corrosion and moisture resistant – Suitable for internal and external use
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No on-site assembly required – Simple, fast installation
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Maintenance-free and long-lasting – Designed for lifetime performance
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Lightweight design – Easy to handle and install by one person
Applications
Ideal for use in:
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Flat entrance doors and communal corridors
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Apartment and multi-occupancy buildings
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Offices, retail units, and commercial doors
Technical Details
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Fire Rating: Up to 40 minutes (tested to BS 476: Part 22)
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Nominal Sizes:
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10 inch (265 x 70 mm) – fits opening 234 x 55 mm
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12 inch (305 x 70 mm) – fits opening 272 x 55 mm
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Finishes: Satin Aluminium, Polished Silver, Polished Gold, Satin Gold
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Frame Type: Black Plastic or Aluminium Security Cover
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Recommended Sealant: Firesure® Intumescent Mastic for gap sealing and fire performance integrity
Installation Guidance
Do not cut the aperture until the letter box is on site. Aperture dimensions may vary due to the thickness of the intumescent liner. Use the supplied template for accuracy and ensure all fittings are level and secure. Always follow current UK Building Regulations and fire door installation standards.