BDM Dalsin Line 3" x 35ft 2 Pieces Pro-Form Aluminum Flex Only w26.125 Do I have to use

Do I have to use B-vent chimney on linear style fireplaces

Height:  6

Protect your fire feature with heavy-duty PVC covers

4-Sided Metal Surrounds

the Attribute vent-free firebox delivers a fireside experience with style

BDM Dalsin Line 3" x 35ft 2 Pieces Pro-Form Aluminum Flex Only w26.125 Do I have to use"Dalsin Line Aluminum Flex Liners are used for venting category 1 heating appliances or direct vent appliances into a masonry chimney. Manufactured using Type 3003 aluminum, this heavy duty 2 ply liner is made from two strips of . 005, high grade aluminum for a total thickness of . 010" Features Liner is made from 2 ply of . 005" thick type 3003 aluminum strip Components are made from . 020 thick type 3003 aluminum Locking seam on liner is the