Installation & Service Manual
1Determine boiler location (continued)
TABLE - 1B
MINIMUM RECOMMENDED COMBUSTION
AIR SUPPLY TO EQUIPMENT ROOM
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| *Outside Air from |
| *Outside Air from | **Inside Air from |
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| Input | 2 Openings Directly from | *Outside Air from | 2 Ducts Delivered from | 2 Ducts Delivered from |
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| Outdoors | 1 Opening Directly | Outdoors | Interior Space |
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| Btu/hr |
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| from Outdoors, in2 |
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| |
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| Top | Bottom | Top | Bottom | Top | Bottom |
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| Opening, in2 | Opening, in2 |
| Opening, in2 | Opening, in2 | Opening, in2 | Opening, in2 |
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| 90,000 | 23 | 23 | 30 | 45 | 45 | 100 | 100 |
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| (148 cm2) | (148 cm2) | (194 cm2) | (291 cm2) | (291 cm2) | (646 cm2) | (646 cm2) |
| |
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| 135,000 | 34 | 34 | 45 | 68 | 68 | 135 | 135 |
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| (220 cm2) | (220 cm2) | (291 cm2) | (439 cm2) | (439 cm2) | (871 cm2) | (871 cm2) |
| |
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| 180,000 | 45 | 45 | 60 | 90 | 90 | 180 | 180 |
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| (291 cm2) | (291 cm2) | (388 cm2) | (581 cm2) | (581 cm2) | (1,162 cm2) | (1,162 cm2) |
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| 199,999 | 50 | 50 | 67 | 100 | 100 | 200 | 200 |
|
| (323 cm2) | (323 cm2) | (433 cm2) | (646 cm2) | (646 cm2) | (1,291 cm2) | (1,291 cm2) |
| |
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| 225,000 | 57 | 57 | 75 | 113 | 113 | 225 | 225 |
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| (368 cm2) | (368 cm2) | (484 cm2) | (730 cm2) | (730 cm2) | (1,452 cm2) | (1,452 cm2) |
| |
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| 270,000 | 68 | 68 | 90 | 135 | 135 | 270 | 270 |
|
| (439 cm2) | (439 cm2) | (581 cm2) | (871 cm2) | (871 cm2) | (1,742 cm2) | (1,742 cm2) |
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| 315,000 | 79 | 79 | 105 | 158 | 158 | 315 | 315 |
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| (510 cm2) | (510 cm2) | (678 cm2) | (1,020 cm2) | (1,020 cm2) | (2,033 cm2) | (2,033 cm2) |
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| 360,000 | 90 | 90 | 120 | 180 | 180 | 360 | 360 |
|
| (581 cm2) | (581 cm2) | (775 cm2) | (1,162 cm2) | (1,162 cm2) | (2,323 cm2) | (2,323 cm2) |
| |
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| 399,999 | 100 | 100 | 134 | 200 | 200 | 400 | 400 |
|
| (646 cm2) | (646 cm2) | (865 cm2) | (1,291 cm2) | (1,291 cm2) | (2,581 cm2) | (2,581 cm2) |
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| 500,000 | 125 | 125 | 167 | 250 | 250 | 500 | 500 |
|
| (807 cm2) | (807 cm2) | (1,078 cm2) | (1,613 cm2) | (1,613 cm2) | (3,226 cm2) | (3,226 cm2) |
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*Outside air openings shall directly communicate with the outdoors. When combustion air is drawn from the outside through a duct, the net free area of each of the two openings must have twice (2 times) the free area required for Outside Air/2 Openings. The above requirements are for the boiler only; additional gas fired appliances in the equipment room will require an increase in the net free area to supply adequate combustion air for all appliances.
**Combined interior space must be 50 cubic feet per 1,000 Btu/hr input. Buildings MUST NOT be of *“Tight Construction”. For buildings of *“Tight Construction”, provide air openings into the building from outside.
*No combustion air openings are needed when the water heater is installed in a space with a volume NO LESS than 50 cubic feet per 1,000 Btu/hr of all installed gas fired appliances. Buildings MUST NOT be of *“Tight Construction”.
* “Tight Construction” is defined as a building with less than 0.40 ACH (air changes per hour).
Vent installations for connection to gas vents or chimneys must be in accordance with “Venting of Equipment,” of the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment or applicable provisions of the local building codes.
Adequate combustion and ventilation air must be supplied to the room where the appliance is installed in accordance with the latest edition of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CGA Standard B149 Installation Code for Gas Burning Appliances and Equipment, or applicable provisions of the local building codes.
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