HVAC Contractor

Does anyone have a HVAC contractor they might recommend? We need to install a fresh air intake duct for our furnace room. Thanks!

coolman

in Heating and Air Conditioning 10 years and 11 months ago

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steam_man | 10 years and 10 months ago

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1 Sq.in./ 1,000 BTUs is only accurate for air from adjacent spaces. I think you said you were going to be taking air from outdoors in your original post. That makes your required openings smaller. Look below and get back to me. Here’s what the code says: **Air from adjacent spaces.** Where the volume of the room in which the fuel-burning appliances are located does not comply with Section 702.2, additional inside combustion and dilution air shall be obtained by opening the room to adjacent spaces so that the combined volume of all communicating spaces meets the volumetric requirement of Section 702.2\. Openings connecting the spaces shall comply with Sections 702.3.1, 702.3.2 and Figure A-1 of Appendix A of this code. 702.3.1 Number and location of openings. Two openings shall be provided, one within 1 foot (305 mm) of the ceiling of the room and one within 1 foot (305 mm) of the floor. 702.3.2 Size of openings. The net free area of each opening, calculated in accordance with Section 708, shall be a minimum of 1 square inch per 1,000 Btu/h (2201 mm2/kW) of input rating of the fuel-burning appliances drawing combustion and dilution air from the communicating spaces and shall be not less than 100 square inches (64 516 mm2). **703.1 All air from the outdoors.** Where all combustion and dilution air is to be provided by outdoor air, the required combustion and dilution air shall be obtained by opening the room to the outdoors. Openings connecting the room to the outdoor air shall comply with Sections 703.1.1 through 703.1.4, and Figures A-2, A-3 and A-4 of Appendix A of this code. The size of the openings connecting the room to the outdoor air supply shall also comply with any applicable rules of the New York City Department of Environmental Protection. 703.1.1 Number and location of openings. Two openings shall be provided, one within 1 foot (305 mm) of the ceiling of the room and one within 1 foot (305 mm) of the floor. 703.1.2 Size of direct openings. The net free area of each direct opening to the outdoors, calculated in accordance with Section 709, shall be a minimum of 1 square inch per 4,000 Btu/h (550 mm2/kW) of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room. 703.1.3 Size of horizontal openings. The net free area of each opening, calculated in accordance with Section 709 and connected to the outdoors through a horizontal duct, shall be a minimum of 1 square inch per 2,000 Btu/h (1100 mm2/kW) of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening. 703.1.4 Size of vertical openings. The net free area of each opening, calculated in accordance with Section 709 and connected to the outdoors through a vertical duct, shall be a minimum of 1 square inch per 4,000 Btu/h (550 mm2/kW) of combined input rating of the fuel-burning appliances drawing combustion and dilution air from the room. The cross-sectional area of the duct shall be equal to or greater than the required size of the opening.

coolman | 10 years and 10 months ago

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Thanks, but do you mean 1 sq inch per 1,000 BTU?

ellenlourie | 10 years and 10 months ago

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You need 1 square inch clear opening per 10,000 btu input. These things are done by heating/boiler contractors.

steam_man | 10 years and 10 months ago

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You’re welcome. Unfortunately I don’t have time today to look it up. Search the Fuel Gas and Plumbing codes for combustion air. And there is no opinion. There is only the code. MUHAHAHAHA

coolman | 10 years and 10 months ago

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SteamMan, Thanks for the input. Any idea on what section of the code we should consult. Going a bit crazy on figuring this one out and seems like there are lots of differing views.

steam_man | 10 years and 10 months ago

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144 sq. in. is something I hear A LOT in this business but it is misleading. The Code is very clear on how many square inches per BTU are required when utilizing different methods of bringing in combustion air. Be very careful and consult the code or a person who is familiar with it before you invest anything in doing this. I’d hate to see you fail your inspection because some plumber said the magic number of 144 sq.in. -SteamMan

coolman | 10 years and 11 months ago

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Thanks. The situation is the furnace room in the basement is being enclosed as the basement is being converted to a kitchen/dining/living space. Because of the enclosure NYC DOB requires a 144 square inch of fresh air intake to the furnace room.

brucef | 10 years and 11 months ago

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You may want an iron shop, if you need to fabricate a hooded, grill thru a hatch. Normally we don’t duct fresh air intake, as the furnace is pumping hot air up the flue, thereby sucking fresh air into the boiler room.