AIR FOR |
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COMBUSTION |
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| If the area in which the heater may be operated is smaller than |
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| that defined as an unconfined space, provide adequate combus- |
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| tion and ventilation air by one of the methods described in the |
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VENTILATION |
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| National Fuel Gas Code, ANSI Z223.1, 1992, Section 5.3. |
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Continued | VENTILATION AIR |
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| Ventilation Air From Inside Building |
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| This fresh air would come from an adjoining unconfined space. When ventilating to an |
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| adjoining unconfined space, you must provide two permanent openings: one within 12" of the |
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| ceiling and one within 12" of the floor on the wall connecting the two spaces (see options 1 and |
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| 2, Figure 8). You can also remove door into adjoining room (see option 3, Figure 8). Follow |
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| the National Fuel Gas Code NFPA 54/ANSI Z223.1, Section 5.3, Air for Combustion and |
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| Ventilation for required size of ventilation grills or ducts. |
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| WARNING ICONG 001WARNING |
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| Rework worksheet, adding the space of the adjoining unconfined |
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| space. The combined spaces must have enough fresh air to supply all |
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| appliances in both spaces. |
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12"
| Ventilation Grills |
Ventilation | Into Adjoining Room, |
Option 2 | |
Grills | Or |
into Adjoining | Remove |
Room, | Door into |
Option 1 | Adjoining |
| Room, |
| Option 3 |
12"
Figure 8 - Ventilation Air from Inside Building
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