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4''x 25' Round 2-Ply Aluminum Flex Liner Sold by the Roll - Flex409
National Chimney$365.89National Chimney’s 2-Ply 3003 aluminum liner can be used to vent Category I gas appliances with A.F.U.E. of 83% or lower. In many cases, especially when only water heaters are vented into masonry flues, the gas appliances are vented into oversized... -
4" x 25' Stainless Steel Flex Liner Kit (includes cap, flashing, adapter, hardware) - Flex 405KA
National Chimney$437.774" x 25' Stainless Steel Flex Liner Kit (includes cap, flashing, adapter, hardware) - Flex 405KA. There is no reducer in this kit.