Materials and Construction PelletVent for multi-fuel is a double-wall pipe with an inner wall of superferritc stainless steel and a laser-welded galvalume outer wall. Painted black exterior available. Clearances 3" clearance to combustibles in the USA and Canada for appliances using multi-fuels or oil. Diameters 3" and 4" Listings c-UL-us Listed to UL 641 (MH8381 and MH14420). ULC Listed to ULC S609, ULC/ORD C441 (CMH1439 and CMH1440). |