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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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 4
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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 |
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 |
CHIMNEY | OUTSIDE |
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OR GAS |
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VENT | WATER |
| HEATER |
| OUTLET AIR |
FURNACE |
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| INLET AIR |
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 communi- cate directly with the outdoors, each opening 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 5 | FIGURE 6 |
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