Duravent 22" X 25' X 1/2" Thick Profoil For 3" - 5 1/2" Diameter - 56rnspfb22x25, 810001822

Features:

• Use as Insulator for Stainless Steel Liners in Masonry Chimneys
• UL Listed Insulation
• Size is based on Vent Diameter
• Required to Insulate Stainless Steel Liner to meet UL 1777 when Proper Clearances to Chimney and Framing are not available
• 1” Clearance from SS Liner to Interior Wall of the Masonry Chimney and 1” Clearance from the Masonry to the House Framing are Required in order to meet UL 1777
• If you do not have either of these Clearances then a ½” Wrap is Required
• If these Two Clearances are available then no Insulation is needed
• AluFoil Tape and ProMesh Required