Use 5' and 10' lengths of Super Wrap 1/2 thick 4ml protective foil face insulation to seal off the fireplace damper when installing a fireplace insert.
Chimney liner in Firewood and Wood Heating
Wood Fireplace Insert Installation Overview by Rockford Chimney Supply
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Free shipping on Pre Insulated flexible chimney liner kits. The Pre Insulated chimney liner is UL Listed & features 1/2 insulation to keep flue gases
Pre-Insulated Chimney Liner Kit, Flexible Stainless Steel
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Rockford Chimney Supply 316 Stainless Steel Flexible Chimney Liner Insert Kit, 6 inch x 25 Feet 625S-AC