DuraVent DirectVent 4 in. D X 8-1/2 in. L Galvanized Steel Exhaust Vent Pipe

Designed for appliances tested and listed for direct vent and features a fully unitized twist-lock construction. Use of sealant is optional, unless specified by the appliance manufacturer. To calculate install length, subtract 1 1/2″ for each joint. No beads or hems, allowing for a beautiful, sleek finish that looks great in any interior. All DirectVent Pro black pipe lengths feature exterior laser-welded seams.Features a .020\ aluminum inner wall and .018\ galvanized outer wall,Outer pipe brings combustion air to the appliance,Inner pipe exhausts flue gases to the outside,Gaskets or sealants not required (unless specified by the appliance manufacturer),Black painted outer wall with laser-welded outer wall seams for a sleek finish