Furnace Vent Pipe Clearance

Clearance is the distance that is considered to be safe between a heat producing appliance chimney chimney liner vent pipe vent connector or other hot surfaces and combustible materials. American gas association has certified the design of condensing furnaces for a minimum of 0 clearance from combustible materials with a single wall plastic vent pipe. Maximum horizontal section of the furnace water heater double wall vent pipe cannot be longer than 100 of the vertical vent pipe length.

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I m trying to confirm the necessary clearance for a direct vent concentric pipe on a 95 propane furnace.

Furnace vent pipe clearance.

Early 1900 s to about 1975 it was used. The clearance between gas vents and combustible materials is listed by the manufacturer but is typically 1 inch for type b. Typical listed and labeled double wall vent pipe clearance to combustible materials is one inch but you should always check before installation. Metal double wall b vent requires 1 inch minimum clearance.

Each type of vent pipe has recommended clearances to combustible materials. Below are the allowable clearances for a number of common situations. Inadequate clearance from combustibles at the gas vent stack for the furnace at the drywall and wooden structural components. I ve checked the vendor literature and don t see the specific senario that i m looking at.

Colour illustration of direct vent sidewall terminal clearance distances adapted from american standard furnace installation instructions that in turn cites ansi z223 1 nfpa 54 national fuel gas code for us installations and cites csa b149 1 natural gas and propane installation code for canadian direct vent gas vent installations. Transite a whitish looking cementious pipe containing asbestos material. What are the allowable clearances. Metal single wall generally requires 6 inches of clearance.

In my situation there is a three foot space between the edge of a window and a wall. See direct vents side wall vents for a complete table of recommended clearance distances from a direct vent gas appliance terminal to other building components or features. I know that the clearance from an operable window is 12 but what is the required distance from a side wall. Furnace water heater vent pipe clearance double wall.