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| Ventilated Space Air Requirements for | ||
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| (a) |
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| U.S. Installations | |||||
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| Refer to Figure 5 (a), (b), (c) or (d) for proper sizing and | ||
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| location of combustion air ducts and openings. CHECK | ||
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| PERMANENT |
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| LOCAL CODES. | |||||||||||||
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| OPENINGS |
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| a) Equipment located in ventilated spaces; all air from | |||||||||||||
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| VENTILATED |
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| UNCONFINED |
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| inside the building. | ||||||||||||||||||
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| SPACE |
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| Two permanent openings shall be provided connecting | ||||||||||||||||||
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| SPACE |
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| to ventilated space (e.g. closet, small room) with the | |
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| unconfined space. Each opening shall be equal or | |
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| EQUIPMENT LOCATED IN VENTILATED |
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| greater than 645cm2 (100 in2.) with a width to height | |||||||||||
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| SPACES; ALL AIR FROM INSIDE THE BUILDING. |
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| ratio of 2:1. The top opening shall be located close to | ||||||||||||||||||||||||
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| the ceiling. | ||
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| (b) |
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| VENTILATED |
| COMBUSTION |
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| PERMANENT |
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| 300mm |
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| VENTILATION |
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| Note: The opening shall not be lower than the top of the | ||||||||||||||||||||||||||
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| SPACE |
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| AIR DUCT |
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| (12 in.) |
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| AIR. |
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| heater. The location of the bottom opening shall be 150- | |||||||||||||||
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| 300mm |
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| 450mm | ||||||||||
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| (12 in.) |
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| ABOVE |
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| GRADE |
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| b) Basement installation, equipment located in ventilated | |||||||||
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| OR |
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| SNOW |
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| spaces; all air from outdoors. | ||||||||
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| LINE |
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| Refer to the latest edition of the "National Fuel Gas | ||||||
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| Code" ANSI Z223.1 for air supply duct sizes and | |||||||||
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| restrictions. | |
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| c) Equipment located in ventilated spaces; all air from out- | ||
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| BASEMENT INSTALLATION, EQUIPMENT LOCATED |
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| 300mm |
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| IN VENTILATED SPACES; ALL AIR FROM OUTDOORS | (12 in.) |
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| Refer to the latest edition of the "National Fuel Gas | ||||||||||||||||||||||||||||||
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| Code" ANSI Z223.1 for air supply duct sizes and | |
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| (c) |
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| OUTDOORS |
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| restrictions. | |||||||||||||||||
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| AIR DUCT |
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| 300mm (12 in.) |
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| d) Equipment located in ventilated spaces; all air from out- | ||||||||||||||||
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| doors through ventilated attic. | |
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| Refer to the latest edition of the "National Fuel Gas | |
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| Code" ANSI Z223.1 for air supply duct sizes and | |
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| restrictions. | |
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| VENTILATED |
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| VENTILATION |
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| COMBUSTION |
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| SPACE |
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| Note: Ensure sufficient ventilation air to prevent elevat- | ||||||||||||||||
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| ed temperatures in closets and ventilated spaces. | ||
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| When an exhaust fan is installed in the same room as the | ||
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| EQUIPMENT LOCATED IN VENTILATED |
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| water heater, the supply air openings must be of sufficient | ||||||||||||
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| 300mm (12 in.) |
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| SPACES; ALL AIR FROM OUTDOORS. |
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| capacity to prevent a backflow of air through the water | |||||||||||||||||||||||||||
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| heater exhaust venting. | ||
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| OUTLET |
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| 300mm (12 in.) |
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| EQUIPMENT LOCATED IN VENTILATED SPACES; ALL |
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| AIR FROM OUTDOORS THROUGH VENTILATED ATTIC. |
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Figure 5 Combustion Air Supply Openings And Ducts |
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