AIR FOR COMBUSTION AND VENTILATION | 5 |
Determining | |
Ventilation Air |
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AIR FOR COMBUSTION AND | VENTILATION AIR | ||||||||
VENTILATION |
| Ventilation Air From Inside Building | |||||||
Continued |
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| This fresh air would come from an adjoining unconfined space. | ||||||
3. Add the Btu/Hr of all fuel burning appliances in the space. | When ventilating to an adjoining unconfined space, you must | ||||||||
provide two permanent openings: one within 12" of the ceiling and | |||||||||
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| _____________ Btu/Hr | one within 12" of the floor on the wall connecting the two spaces | ||||||
| Gas water heater* |
| _____________ Btu/Hr | (see options 1 and 2, Figure 2). You can also remove door into | |||||
| Gas furnace |
| _____________ Btu/Hr | adjoining room (see option 3, Figure 2). Follow the National Fuel | |||||
| Vented gas heater |
| _____________ Btu/Hr | Gas Code, ANSI Z223.1/NFPA 54, Section 5.3, Air for Combustion | |||||
| Gas fireplace logs |
| _____________ Btu/Hr | and Ventilation for required size of ventilation grills or ducts. | |||||
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| Other gas appliances* + | _____________ Btu/Hr |
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| Total | = | _____________ Btu/Hr |
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| 12" |
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| * Do not include |
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| bustion air from the outdoors and vents to the outdoors. |
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| Ventilation Grills | ||||
| Example: |
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| Ventilation |
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| Into Adjoining Room, | |||
| Gas water heater |
| 40,000 | Or |
| Option 2 | |||
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| Grills |
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| _____________ Btu/Hr | into Adjoining | Remove |
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| 10,000 |
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| + | Room, | Door into |
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| _____________ Btu/Hr | Option 1 | Adjoining |
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| Total | = | 50,000 |
| Room, |
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| _____________ Btu/Hr |
| Option 3 |
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4. | Compare the maximum Btu/Hr the space can support with the actual |
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| amount of Btu/Hr used. |
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| __________________ Btu/Hr (maximum the space can support) |
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| 12" |
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| __________________ Btu/Hr (actual amount of Btu/Hr used) |
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| Example: 51,200 Btu/Hr (maximum the space can support) |
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| 50,000 Btu/Hr (actual amount of Btu/Hr used) |
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The space in the above example is a confined space because the actual Btu/ | Figure 2 - Ventilation Air from Inside Building | ||||||||
Hr used is more than the maximum Btu/Hr the space can support. You must | |||||||||
Ventilation Air From Outdoors | |||||||||
provide additional fresh air. Your options are as follows: | |||||||||
A. | Rework worksheet, adding the space of an adjoining room. If the ex- | Provide extra fresh air by using ventilation grills or ducts. You must | |||||||
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tra space provides an unconfined space, remove door to adjoining | provide two permanent openings: one within 12" of the ceiling and | |
room or add ventilation grills between rooms. See Ventilation Air From | ||
one within 12" of the floor. Connect these items directly to the | ||
Inside Building. | ||
outdoors or spaces open to the outdoors. These spaces include attics | ||
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B.Vent room directly to the outdoors. See Ventilation Air From and crawl spaces. Follow the National Fuel Gas Code, ANSI Z223.1/
Outdoors. | NFPA 54, Section 5.3, Air for Combustion and Ventilation for | ||||||||||||
C. Install a lower Btu/Hr heater, if lower Btu/Hr size makes room un- | required size of ventilation grills or ducts. | ||||||||||||
confined. | IMPORTANT: Do not provide openings for inlet or outlet air into | ||||||||||||
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can | attic if attic has a | ||||||||||||
support, the space is an unconfined space. You will need no additional fresh | entering the attic will activate the power vent. | ||||||||||||
air ventilation. |
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WARNING: If the area in which the heater may be operated is smaller than that defined as an uncon- fined space or if the building is of unusually tight construction, provide adequate combustion and ven- tilation air by one of the methods described in the National Fuel Gas Code, ANSI Z223.1/NFPA 54, Sec- tion 5.3 or applicable local codes.
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| Outlet | Ventilated | ||||||||||||
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| Air | |||||||||||||
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Outlet |
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Air |
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| To Attic | ||
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| To | ||
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| Crawl | ||
Inlet |
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| Space | ||
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Air |
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| Inlet Air |
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| Ventilated |
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| Crawl Space |
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Figure 3 - Ventilation Air from Outdoors
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