![Method 2 (normally applied in cold climate regions):](/images/new-backgrounds/35648/3564821x1.webp)
Method 2 (normally applied in cold climate regions):
1.The mechanical equipment room must be provided with at least one permanent opening, commencing within 12 inches of the top of the enclosure.
2.The opening must communicate directly or by ducts with outdoors.
3.The opening must have a minimum free area of 1 sq. in per 3000 BTUH of the total input rating of all equipment in the room, or no less than the sum of the areas of all vent connectors in the confined space.
.Refer to the latest version of NFGC, part 5 for additional information.
WARNING:
Do not use one permanent opening method (Method 2) if the equipment room is under negative pressure condition or the equipment is common vented with other
COMBUSTION AND VENTILATION AIR SUPPLY (FOR CANADA INSTALLATION)
CAUTION:
All combustion air has to be drawn from the air outside the building (the mechanical equipment room directly communicates with the outdoors).
1.Ventilation of the space occupied by the boiler shall be provided by an opening(s) for ventilation air at the highest practical point communicating with outdoors. The total
2.When air supply is provided by natural air flow from the outdoors for natural draft, partial fan assisted,
3.When air supply is provided by natural air flow from outdoors for a power burner and there is no draft regulator, draft hood or similar flue gas dilution device installed in the same space, in addition to the opening for ventilation air required in (1), there shall be a permanent air supply opening(s) having a total
4.Refer to the latest version of
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