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17 Cards in this Set
- Front
- Back
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Where is an outdoor Air Supply not required when installing a single water heater |
When the water heater has an input of 50 MBH and is within an enclosure or structure were no other appliances require an air supply |
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At what length must you increase the round duct diameter by one size when sizing air supply |
20 ft |
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When an appliance located within an enclosure and a permanent opening is sized and located to allow communication between the enclosure and the rest of the structure the opening provided shell has a free area of not less than |
1 inch square per 1000 BTU h |
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When an opening is made to allow they're into an enclosure from the rest of the structure to provide Air Supply for an appliance where must this opening be located |
6 to 18 in above floor level |
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When an opening is put into a wall for Air Supply from the building as well as the opening near the floor where else do you require an opening |
As near the ceiling is practical but in no case lower than the relief opening of the lowest draft controlled device |
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Where should Air Supply opening terminate near the appliance |
Within 1 foot above and within 2 feet horizontally from the burner of the appliance having the largest input |
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When can a square or rectangular duct be used for Air Supply |
When the required free area of the Air Supply opening is 9 in squared or larger |
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An Air Supply Inlet opening from the outdoors shall be equipped with what |
A means to prevent the direct entry of rain and wind and that such mean she'll not reduce required free area of |
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Minimum height above grade for an air supply Inlet |
12 in |
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Minimum distance from an Air Supply opening to a moisture exhaust |
3 feet |
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At how many BTUs does Supply Air have to come from outside |
Over 400,000 BTU |
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What other consideration must be made when a total input of all appliances exceeds 400,000 BTU |
Space containing the appliances must be vented |
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Minimum chimney size |
12 square inches or 4 inch round diameter |
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When two or more openings are provided into one chimney flue they shall be |
At different levels |
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A chimney must be provided with a |
Clean-out opening |
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Minimum size of a vent |
No less than the area of a 3in diameter pipe |
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Minimum discharge distance of any pool heater to any of building opening |
10 feet |
