Transite generally requires 1 to 3 inches depending on various factors. Metal Double wall / “B” vent requires 1 inch minimum clearanceģ. Metal single wall generally requires 6 inches of clearanceĢ. Each type of vent pipe has recommended clearances to combustible materialsġ. Transite – a whitish looking cementious pipe containing asbestos material. Metal Double wall vent pipe, often called “B” vent pipeģ. When this happens, the vents may end up too close to wood or other combustible materials.įire safety There are several different types of vent piping, including:Ģ. When homes are remodeled, new furnaces or water heaters are installed or the home has been reroofed, vents get moved or shifted a little and loose the proper clearance to combustible materials.
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