Fire Door Gap Gauge
The gaps between a Fire Door and its frame need to be 2 to 4mm in width to ensure that both the door can close smoothly and that the fire cannot spread through the gap of the fire door. Our Fire Door Gap Gauge is a handy tool designed with a clearly marked dark blue "Recommended Door Gap" area and red "Door Gap Not Recommended" area. Quickly tell at a glance if the gaps around a fire door are within the acceptable range.
- Lightweight and durable plastic body
- Angular construction ensures no-fuss, intuitive use regardless of architrave
- Simple insert-and-glance design with clearly marked "Recommended Door Gap" area
- Ideal companion for the FREE Safelincs Fire Door Inspection Checklist
- Compact design for easy storage and transport – fits in your pocket!
Please Note: The Fire Door Gap Gauge is not calibrated and may vary by ±0.5mm. A more careful examination with calibrated measuring equipment may be necessary if any gap just meets either edge of the "Recommended Door Gap" area.
Customer Reviews (64)
Reviews by Real Customers
All of our product reviews are written by real customers that have purchased this product from us and are published without modification.
Reviewed by
M M
Published on
13th June 2026
Reviewed by
A W
Published on
9th May 2026
Excellent fast delivery
Reviewed by
J M
Published on
30th April 2026
Item is exactly as expected
Reviewed by
A A
Published on
17th October 2025
Great Product I will be ordering some others soon.
Reviewed by
K N
Published on
6th June 2025
Perfect tool for the job
Technical Data
| Product Code | PRLFDGG |
|---|---|
| Brand | Safelincs |
| Manufacturer's Part Number | PRLFDGG |
| Colour | White |
| Material | Plastic |
| Suitability | Double Doors |
| Single Doors | |
| Dimensions (Unit) |
|
| Weight | 10g |
Fire Door Installation
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Fire Door Inspection
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Simple handy pocket size gauge that clearly defines if the door gaps in in acceptable tolerance or not.