Reinstate the fire resistance functionality of wall and ground constructions Uninsulated air flow duct assemblies are meant for use in environments wherever the clearance to combustible elements and combustible assemblies is at the least 18 inches. ROCKWOOL Curtainrock® is usually a stone wool insulation board created for use in ASTM https://fireratedductworth80223.newbigblog.com/43286005/detailed-notes-on-fire-rated-insulation-for-ductworth