In the event of fire the intumescent liner expands rapidly and seals off the letterbox opening, preventing the spread of fire and smoke whilst maintaining the integrity of the fire door assembly.

• Letterbox flaps open to 180 degree
• Adjustable telescopic sleeve set to suit 40 - 80mm door thickness
• Fitted with brush pile draught excluders
• Integral sound dampening bumpers
• Wide range of letter flap finishes - polished gold, SAA (satin anodised aluminium) or polished silver
• Ergonomic curved edge design
• Fully sealed backplate
  
  

Fire Rating & Testing

• Fire Tested to BS 476 part 22: 1987, 30 minute rated
• Smoke tested to BS476 Part 31/1: 1983
• Acoustic Tested to BS EN ISO 140-3:1995 Achieving 32dB Rw
• Security tested to BS EN 13724 Clause 6.6.5 (Compliant within scope of PAS 23/24)

Dimensions

10” 272mm

Overall length: 272mm
Overall height: 70mm
Aperture Width: 221mm
Aperture Height: 37.5mm

12” 306mm

Overall length: 306mm
Overall height: 70mm
Aperture Width: 254.5mm
Aperture Height: 37.5mm

Installation

1. Measure the external dimensions of the central telescopic section (including the fitted intumescent liner) to ascertain the aperture cut-out.

2. Carefully cut an aperture in the fire door leaf up to 1050mm from the bottom of the door. Please ensure that the aperture is a tight fit to allow the fixing of wood screws into the corner of the face plates.

3. The face plate fitted with the integral draught excluders should be located to the internal face of the door.

4. Locate the letter box into the cut aperture and secure using 4no. steel wood screws into each face plate.

5. To maintain the fire proof integrity of the fire door ensure any gaps between the letter box and the door aperture are sealed using our intumescent sealant.