If you are stripping paint using a blowtorch and some of the paint may fall still on fire then using one of those loosely woven cotton dust sheets to catch the debris isn't too good an idea. The flake of flaming paint will make a hole in the dust sheet and then the dustsheet acts as tinder as the hole get larger and larger by the minute with all the edges glowing red, and with it difficult to put out.
As luck would have it this was outdoors and I was attempting to stop all the small paint flakes falling on a flower bead and contaminating the soil. I was removing 6 layers of stone paint that required a fairly fierce flame in order to shift a strip of more than a couple of cm.