Gas Furnace Roof Vent Height

The design btuh british thermal units per hour.

Gas furnace roof vent height.

Flue gas temperature flue gas temperature affects vent operation because the hotter the gases are the lighter they are. Soffit clearance clearance d b and e are 9 for 10k to 50k btuh and 12 for 50k btuh and larger furnaces gas regulator vent outlet. Also known as the type b this vent is operating on the natural air convection. Keep vent terminations away from these.

Termination must be a min 2 above anything within 10 of it. For many homes a gas furnace is the preferred heating device it has proven to be an efficient and reliable way of meeting household heating needs over the years. This structure generally uses the furnace vent pipe through roofbecause the b venting pipe is designed in vertical manner. This was 14 inches on the northwest side of the home.

Heat loss in the vent 3. E is for unventilated soffit. The 1992 vent sizing tables require that all type b gas ventsterminate above the roof with a listed cap or listed roof assembly in accordance with the manufacturer s instructions. 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.

Restrictions to flow and 6. Vent caps 12 and smallermay terminate a distance above the roof if 8 feet or more away from a vertical surface as follows. Joined oct 11 2008 40 022 posts 2 mar 4 2010. I around the electrical and gas meters as well as a lp regulator there will always be a hole through the building exterior.

Discussion starter 1 mar 4 2010 edited 12345. Jump to latest follow 1 20 of 47 posts. Joined nov 10 2009 764 posts. Vent connectors slope in ft upward to chimney vent not smaller than appliance flue up to 2 sizes larger than appliance flue length depends on type for single appliance single wall 75 of vent height b vent 100 of vent height 18 inch diameter for multiple appliances 34.

The top of the chimney should be at least two feet above anything within a ten foot radius of the chimney. Vent system capacity 5. When the vent is withdrawing air from the house it expels the gas outside through the vent. See the detailed b vent chimney rooftop clearance table below.

Open vent pipes that extend through a roof shall be terminated at least 6 inches 152 mm above the roof or 6 inches 152 mm above the anticipated snow accumulation whichever is greater except that where a roof is to be used for any purpose other than weather protection the vent extension shall be run at least 7 feet 2134 mm above the roof. 1 of 3 go to page. The vent pipe or flue is a vital component of the furnace that transmits emissions from the combustion process out of the building.