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Fire Rated Letterboxes and Letterplates
Fire rated letterboxes and letterplates are essential components in a compliant fire-rated door assembly, offering protection where mail delivery creates a necessary breach in the fire-resisting barrier. These products are designed to help maintain the fire integrity of doorsets by resisting the passage of smoke, flame and hot gases during a fire. Their use ensures that, even when integrated into a fire-rated door, the door retains its compartmentation role. Letterplates and letterboxes often form part of a broader system of passive protection and are regularly specified alongside other fire stopping products including intumescent seals, door edge protectors and compliant ironmongery.
Astroflame Intumescent Fire Rated Telescopic Letterbox System
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...
Astroflame Intumescent Fire & Smoke Rated Telescopic Letterboxes
Robust commercial metal framed telescopic letterbox with metal flaps and a high performance intumescent liner, fire and smoke rated for 30 or 60 minutes. In the event of a fire the intumescent liner expands to seal the letterbox aperture and retains the fire integrity of the door. Fitted with brush pile draught excluders and sound dampening...
Norseal Advantage Fire-Rated Letterplates
Fire resisting timber doorsets, 40-80mm thick, lined with intumescent material to improve safety of doors with letterboxes and apertures. Fire resistance in accordance with BS 476-22. Anti-snap flap with 180 degree opening. Tested in accordance with TS32 (15,000 cycles). Water tightness up to 200Pa in accordance with BS 5368-3. Plastic...
Astroflame Anti-Fire Smoke & Acoustic Letter Plates
Specially designed to increase the safety, comfort and security of occupants against Fire, Smoke and Noise Pollution. The range includes models which are either fire & smoke rated from 30 minutes to 1 hour particularly suitable for multiple occupancy residential buildings. Tested to BS 476 PART 22 for 30 or 60 minutes fire rating...
Norseal NOR400 Edge Letterplates
Letterplates with plastic frame, high quality zinc flaps, for fire resisting timber doorsets, 40-80mm thick, with fire resistance up to 60 minutes. Bolted together Fire resistance in accordance with BS 476-22 Anti-snap flap with 180 degree opening A4 aperture to BS 2911 Salt spray tested to BE EN 1670 - Class 5 20,000 cycle tested
Norseal Advantage Plus Fire-Rated Letterplates
Letterplates for fire resisting timber doorsets, 40-80mm thick. Aluminium. Bolted together and screwed. Fire resistance in accordance with BS 476-22. Anti-snap flap with 180 degree opening. A4 aperture to BS 2911 (P209 only). 303x70 (255x37 internal dimension).
Norseal NOR400 Letterplates
High quality zinc letterplates for fire resisting and acoustic timber doorsets, 40-80mm thick. Bolted together. Fire resistance in accordance with BS 476-22. Anti-snap flap with 180 degree opening. A4 aperture to BS 2911. Salt spray tested to BE EN 1670 - Class 5. Sound reduction up to 95% of door’s fully caulked performance (FCP) when...
UAP Soterian Slim Letterplate
Stylish, streamlined and secure, the ultimate letterplate made to protect and perfect your door. Its extreme compactness is what sets it apart from anything else currently on the market. Most compact TS008 letterplate on the market - less than 2 minutes fitting time! Designed for 44mm - 70mm composite, timber and uPVC doors Quick and easy...
UAP Soterian Letterplate
Stylish, streamlined and secure, the ultimate certified letterplate made to protect and perfect your door. It is highly engineered with over 120 different processes in each letterplate, setting it apart from anything else currently on the market. Aluminium flap constuction Quick and easy fitting Can withstand thousands of openings Smooth...
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Certified Fire Rated Letterplates and Letterboxes for Fire Door Assemblies
Fire rated letterplates and letterboxes are used in fire door assemblies where building users require post delivery without compromising the fire compartmentation of the doorset. These components are typically used in conjunction with fully tested and certified door upgrade kits, especially when retrofitting existing doors to improve their fire resistance. These kits often include intumescent letterplate liners, smoke seals, and installation guidance to ensure correct fire performance across the door assembly.
These products play a critical role in preserving fire integrity where penetrations exist. Fire rated letterplates are built to expand under heat, closing off the opening and preventing the passage of smoke and flames. In a fire scenario, they help maintain the compartment’s resistance by preventing early failure of the door’s protective function. Products are supported by fire test evidence - either full third-party certification or assessments from recognised fire consultants - to confirm their use in specific door constructions, materials and configurations.
Letterplates and letterboxes in this category are subject to fire testing as part of complete doorset systems. Results depend on installation details such as the door core type, dimensions, and accompanying hardware. Only approved configurations should be used, and these should align with guidance from assessment reports and product certification schemes to ensure building regulation compliance.
Fire Rated Letterboxes and Letterplates FAQs
Can I install a fire rated letterplate on any door?
No. Fire rated letterplates must only be installed on doors that have been tested with the same or equivalent product type, and within the scope of an assessment or third-party certification. Installing them on untested doors can invalidate the fire performance.
Do fire rated letterboxes need intumescent liners?
Yes. Intumescent liners are usually required as part of the fire test evidence for the letterplate assembly. These liners expand under heat, helping to seal the opening against fire and smoke spread.
What fire rating durations are available for letterplates?
Most fire rated letterplates are available with ratings of 30, 60, or 90 minutes, depending on the tested configuration. The rating must match the performance of the complete doorset.
Can these products stop smoke as well as fire?
Fire rated letterboxes are often tested for smoke leakage as well, but only if they include the appropriate smoke seals or components tested for cold smoke resistance.
Is third-party certification required for compliance?
It is not mandatory by law, but many tender specifications and regulators now expect third-party certification. This provides assurance that the product’s performance has been independently verified and monitored.