"Easy to use, you don't need the draft excluder bit because the intumescence strip swells to close any gaps when it heats in a fire. Because the door was subject to drafts i chose the draft excluder option. You may need to give it another 1mm of leeway when fitting it because the fit might be too snug."
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Review 2 for Firestop Fire & Smoke Intumescent Seal White 15 x 4 x 1050mm Pack of 5
"Fitted some of theses strips to a firedoor without any problems, although they're only 1m long so there is an issue with having to add/cut to make up the seals. A nice addition to the pack would be some kind of shims which would allow to adjust the gap."