Materials and Construction
.016” 304 stainless steel inner liner. 
Rigid relining pipe: double-walled with 304 stainless steel inner and galvalume outer. 
Factory insulated between inner and outer walls. 
DuraLiner Rigid Pipe in round or oval, is constructed with built-in fittings and pre-drilled holes (stainless steel rivets included).
Round 5” DuraLiner rigid pipe is constructed with built-in twist-lock and pre-drilled holes. 

Clearances
Rigid double wall: 0” clearance between the liner and masonry and 0” clearance between the masonry and combustibles. 
DuraLiner Flex: 1” clearance to masonry. 
Zero clearance with insulation.

Diameters
5”, 6”, and 8”.

Listings
UL Listed to UL 1777 (MH14420), ULC Listed to ULC S635.