Abstract: Abstract: In order to study the filtering effect and protective mechanism of different towels on indoor fire smoke, a thermal decomposition and smoke production platform with protective testing function was built. PVC materials was used as smoke-producing materials because it is widely used in interior decoration. The 3 common materials of cotton, gauze and microfiber towels on the market were selected to study the protective filtering effects of different towels on PVC fire smoke in wet and dry conditions respectively. And the protection and filtration mechanism of the wet and dry towels for the indoor fire smoke was analyzed combining with the surface morphology of the towels before and after the smoke filtration. The result shows that, 3 kinds of towels have certain protective and filtering effect on PVC material fire smoke. No matter in dry or wet state, the 3 kinds of towels have the same degree of pros and cons for the protection and filtering effect of smoke, i.e. pure cotton towel ＞gauze towel ＞microfiber towel. The protective filtering effect of wet towel on CO, NOx and HCl gas is better than that of dry towel. Compared with dry towels, the protective filtering effect of wet towels on CO gas and HCl gas is greatly improved, and the protective filtering effect of HCl gas is nearly doubled.

Key words: Key words: fire smoke, wet and dry towel, protection and filter, protection mechanism