EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
(Inlet Air from Crawlspace and Outlet Air to Ventilated Attic)
CHIMNEY OR
GAS VENT
VENTILATION LOUVERS
(Each end of attic)
| OUTLET |
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FURNACE | AIR | WATER |
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| HEATER |
VENTILATION |
| INLET |
| AIR | |
LOUVERS |
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(For unheated crawl space) |
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| AIR FLOW |
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NOTE−The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equipment in the enclosure.
FIGURE 3
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| EQUIPMENT IN CONFINED SPACE | ||||||||
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| ALL AIR FROM OUTSIDE | |||||
CHIMNEY |
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| (All Air Through Ventilated Attic) | |||||||
OR GAS |
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VENT |
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| VENTILATION LOUVERS |
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| (Each end of attic) |
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OUTLET
AIR
FURNACE | INLET AIR |
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| (Ends 12 in. |
| above bottom) |
| WATER |
| HEATER |
| AIR FLOW |
NOTE−The inlet and outlet air openings shall each have a free area of at least one square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of the total input rating of all equip- ment in the enclosure.
EQUIPMENT IN
CONFINED SPACE
ALL AIR FROM
OUTSIDE
CHIMNEY
OR GAS
VENT WATER
HEATER
OUTLET AIR
FURNACE |
INLET AIR |
AIR FLOW |
NOTE − Each air duct opening shall have a free area of at least one square inch (645 mm2) per 2,000 Btu (.59 kW) per hour of the total input rating of all equipment in the enclosure. If the equipment room is located against an outside wall and the air openings communicate directly with the outdoors, each open- ing shall have a free area of at least one square inch (645 mm2) per 4,000 Btu (1.17 kW) per hour of the total input rating of all other equipment in the enclosure.
FIGURE 4 | FIGURE 5 |
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