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Fire Door Strips

Fire door strips are the seals fitted around the edge of a fire door or frame that keep a certified door performing as tested. Under heat, intumescent material expands to close the perimeter gap and block flame spread; brush or fin seals work alongside them to hold back cold smoke at ambient temperatures.

Browse intumescent strips for fire-only protection, smoke seals for cold smoke control, and combined fire and smoke variants — available from Lorient, Pyroplex and other leading manufacturers in widths from 10mm to 30mm to suit FD30 and FD60 doors.

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Certifire Approved
Lorient LAS1212K Batwing-On-A-Stick - White

IS1212K/WH

Lorient LAS1212K Batwing-On-A-Stick - White

£6.08 Inc. VAT£5.07 Exc. VAT
599 in stock
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Certifire Approved
FD60
Lorient Brush Seal in Brown

LP2004SS/BR

Lorient SS Fire & Smoke Seal 20x4mm Light Brown

£4.90 Inc. VAT£4.08 Exc. VAT
98 in stock
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Certifire Approved
FD30
Lorient Fire Only Seal in Brown

LP1504FO/BR/DARK

Lorient Fire Only Seal 15x4mm Dark Brown

£3.34 Inc. VAT£2.78 Exc. VAT
303 in stock
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Certifire Approved
FD60
lorient finesse in white

LP2004/FIN/WH

Lorient Finesse Fire & Smoke Intumescent Strip 20x4mm White

£12.06 Inc. VAT£10.05 Exc. VAT
63 in stock
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Certifire Approved
FD60
Lorient Fire Only Seal in Black

LP2004FO/BLK

Lorient Fire Only Seal 20x4mm Black

£4.38 Inc. VAT£3.65 Exc. VAT
195 in stock
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Certifire Approved
FD30
Lorient Fire Only Seal in Brown

LP1004FO/BR/DARK

Lorient Fire Only Seal 10x4mm Dark Brown

£2.78 Inc. VAT£2.32 Exc. VAT
114 in stock
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Certifire Approved
FD30
lorient centre twin fin seal in black

LP1504TS/BLK

Lorient TS (Centre Twin Fin) Acoustic Fire & Smoke 15x4mm Black

£7.88 Inc. VAT£6.57 Exc. VAT
633 in stock
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Certifire Approved
Sale pyroplex brown corner seal

FS1405

Pyroplex Harmony Perimeter Corner Seal - 12mm x 12mm - Brown

£3.44 Inc. VAT£2.87 Exc. VAT£2.34 Inc. VAT£1.95 Exc. VAT
85 in stock
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Certifire Approved
FD30
lorient fire and smoke seal in black

LP1504SS/BK

Lorient Fire & Smoke Seal 15x4mm Black

£3.66 Inc. VAT£3.05 Exc. VAT
20 in stock
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Certifire Approved
FD60
Pyroplex 25mm intumescent strip in white

FO2504/WH

Pyroplex Fire Only Intumescent Strip, 25mm x 4mm x 2.1m, White

£4.32 Inc. VAT£3.60 Exc. VAT
288 in stock
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Choosing the right fire door strip

Every certified fire door relies on a perimeter sealing system to perform as tested. The door leaf itself can hold back fire for 30 or 60 minutes, but without the correct strip fitted into the edge of the door or frame, hot gases, flame and smoke would escape through the perimeter gap long before the door leaf failed. Specifying the right product — and fitting it correctly — is what turns a fire door blank into a compliant FD30, FD30s, FD60 or FD60s assembly.

Intumescent strips, smoke seals and combined seals

There are three broad categories of fire door strip, and the right choice depends on the door's classification:

  • Intumescent strips expand rapidly when exposed to heat, sealing the gap between door and frame to prevent flame and hot gas spread. Used on FD30 and FD60 doors where smoke control is not required.
  • Smoke seals use a brush, fin or pile to block cold smoke at ambient temperatures, before any intumescent has had a chance to activate. They can be fitted alongside a fire-only strip or as a standalone product for draught and acoustic control.
  • Combined fire and smoke seals integrate both functions in a single product — an intumescent core with a brush or fin attached — and are required for doors designated FD30s or FD60s (the "s" denotes smoke).

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