Furnace Flue Pipe Roof Clearance

Metal double wall b vent requires 1 inch minimum clearance 3.

Furnace flue pipe roof clearance.

The top of the chimney should be at least two feet above anything within a ten foot radius of the chimney. See the detailed b vent chimney rooftop clearance table below. Maximum horizontal section of the furnace water heater double wall vent pipe cannot be longer than 100 of the vertical vent pipe length. Furnace water heater vent pipe clearance double wall typical listed and labeled double wall vent pipe clearance to combustible materials is one inch but you should always check before installation.

There are several gas or oil fired heating furnace clearance distance types. Traditional gas fired forced air furnaces produce hot combustion exhaust gasses and therefore need metal vent pipes or chimneys. The top of the flue opening should be at least 10 ft 3 1 m away from any roof surface or other structure. Clearance from combustibles ranging from 0 to 18 to 36 typically depending on the fuel type electric gas oil.

Inadequate fire clearance from combustibles may not be obvious until you open a door such as our client is pointing out in this photograph. Transite generally requires 1 to 3 inches depending on various factors. Fire clearances required range from 6 to 36 depending on the equipment. The pipes can be set in two ways.

Vent caps 12 and smaller may terminate a distance above the roof if 8 feet or more away from a vertical surface as follows. Horizontally through the sidewall or vertically through the roof. Table of type b vent rooftop clearance requirements. Clearance distances for chimneys that are 10 ft 3 1 m or more away from the roof ridge measured at the up roof side of the chimney.

Except for flat and very low slope roofs such as those listed in the table below b vents should be at least two feet above the roof surface as well. The 1992 vent sizing tables require that all type b gas vents terminate above the roof with a listed cap or listed roof assembly in accordance with the manufacturer s instructions. Furnace vent pipe installation code gas furnace venting codes furnace exhaust pipe code furnace flue vent code gas furnace exhaust pipe regulations. Trim back the wood shift the vent or.

When compared to the natural vent this one is more flexible although it is also costlier.