Reinstate the fire resistance general performance of wall and floor constructions Uninsulated air flow duct assemblies are supposed to be used in environments where the clearance to combustible components and combustible assemblies is at the least 18 inches. Ductform has become the British isles’s major brands of fire rated ductwork https://fireratedinsulationforduc34556.blogcudinti.com/36931744/fire-rated-ductworth-an-overview