Insulation: Some time throughout which the duct is exposed to fire right up until a reduction of material insulation balance happens. Oxygen: Oxygen from your air reacts with the fuel within a chemical approach named combustion. Most fires involve an ambiance with at least 16% oxygen content material to burn, https://fire-resistant-ductworth91122.blogdomago.com/35167352/an-unbiased-view-of-caswell-group