CE & UKCA Marked Uninsulated air flow duct assemblies are meant for use in environments where by the clearance to combustible components and combustible assemblies is a minimum of eighteen inches. ROCKWOOL Curtainrock® is usually a stone wool insulation board created for use in ASTM E2307 tested and authorised perimeter https://knoxlcqes.blogcudinti.com/37030162/a-simple-key-for-fire-rated-ductworth-unveiled