The Astroflame Intumescent Fire Rated Telescopic Letterbox System is specifically designed to increase the safety and security of occupants against fire and is particularly suited to multiple occupancy residential buildings. Stylish, ABS framed, telescopic letterbox with metal flaps fitted with a high performance intumescent liner around the telescopic sleeve section.

• 30 minute fire rated letterboxes suitable for FD30/FD30S fire doors
• Telescopic fitting - adjustable to fit doors 40mm-80mm thickness
• Wide range of letter plate finishes
• 10" Standard or 12" Commercial sizes
• High performance intumescent liner
• Tested to BS 476 part 22: 1987, 30 minute rated
• Tested to BS 476 Part 31/1: 1983
• Acoustic tested achieving 32dB Rw
• Tested to BS EN 13724 Clause 6.6.5
• Tested to EN 1634-1, 30 minutes
• Smoke tested in accordance with BS EN 1634-3: 2004

The letterbox flaps open to 180° and the adjustable telescopic sleeve can be set to suit 40mm - 80mm
door thickness.

Acoustic and thermal performance features include brush pile draught excluders, integral sound dampening bumpers and a fully sealed backplate.

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

Available in 10” Standard (272mm x 70mm) and 12” Commercial (306mm x 70mm) sizes.

Cut out required is 241mm x 57mm for standard size letterbox and 274mm x 57mm for commercial size letterbox.

Adjustable to suit door thickness from 40mm – 80mm.

Both 10" and 12" sizes have a black ABS frame, except the SS which has a silver frame. The letterboxes are available in Satin Aluminium, Chrome Plated, Stainless Steel, Polished Silver, Polished Brass or Polished Gold letter plate flaps.

Smoke Testing was conducted to BS EN 1634-3: 2004 smoke control tests for door and shutter assemblies, openable windows and elements of building hardware – Part 3: Smoke control test for door and shutter assemblies.