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The DURAVENT 4BVOK 4" Oval Installation Kit includes a hold-down plate and two starter plates for B vent exhaust applications. Compatible with natural gas or liquid propane, Category I appliances such as furnaces, water heaters, and boilers. It provides the venting capacity of round vent pipe and is listed for Type B and Type BW use/installation in a 2 x 4 wall.
The kit is designed for use with Type-B gas venting systems and is made of galvanized steel.
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