The Selkirk product is zero clearance. The original email for this string addressed a "wrap" question. The Selkirk product is prefabricated and preengineered per job. It looks nice but is EXPENSIVE compaired to a field fabricated duct and wrap. Lead times can also be an issue. If there is a...
Two points here. Zero Clearance to combustibles can be achieved with 1.5" of FireMaster FastWrap+ per the UL 1978 Test which is accepted by NFPA96 and the IMC 2003 or earlier. Google FireMaster FastWrap+ to find out more. They have local representation.
NFPA allows products listed for...