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proper venting of vented fuel-burning appli-
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ational Fuel
Gas Code. ANSI Z223.1/NFPA 54, Air for
Combustion and Ventilation.
All spaces in homes fall into one of the three
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help you classify your space and provide
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may provide enough fresh air for combustion
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additional fresh air.
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construction where:
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If your home meets all of the three criteria
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See
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If your home does not meet all of the three
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Determining
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The
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AIR FOR COMBUSTION AND VENTILATION
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gregate input rating of all appliances installed
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of the aggregate input rating of all appliances
installed in that space. Rooms communicating
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* Adjoining rooms are communicating only if
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DETERMINING FRESH-AIR FLOW
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the rooms.
1. Determine the volume of the space (length
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Length x Width x Height =__________cu. ft.
(volume of space)
Example:
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(volume of space)
If additional ventilation to adjoining room
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volume of these rooms to the total volume
of the space.
2. Multiply the space volume by 20 to determine
the maximum Btu/Hr the space can support.
________ (volume of space) x 20 = (Maxi-
mum Btu/Hr the space can support)
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support)
3. Add the Btu/Hr of all fuel burning appliances
in the space.
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_________ Btu/Hr
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_________ Btu/Hr
Gas furnace
_________ Btu/Hr
Vented gas heater
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_________ Btu/Hr
Other gas appliances* + _________ Btu/Hr
Total
= _________ Btu/Hr
* Do not include direct-vent gas appliances.
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outdoors and vents to the outdoors.