It is approx. 2mm thick, and 40mm brush length.2mm brush thickness? do you mean 2cm?
If you did it internally, just bring it away from the wall/frame slightly. As it would be removable it doesn't matter if it would foul the tracks when fitted.in the inside there is the opening slider things blocking halfway of garage door opening, and you can't start stuffing things down there as it has all the rollers and stuff in it
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