Attic Furnace Requirements

Attic furnace passageway minimum dimensions requirements.

Attic furnace requirements.

So why put an hvac system up in the attic at all. That means you have higher energy costs and less efficiency since you re blowing the air down instead of allowing it to rise naturally. The total drop in efficiency can be up to 35. The opening passageway must allow for unobstructed access.

If you place the furnace in the attic then you must install the infrastructure in the building to force the warm air to the bottom floor. Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts. The passage must not be smaller than 30 high x 22 wide and no longer than 20 unless it s at least 6 tall and then no more than 50 passageways must have a solid floor no less than 24 wide. 904 10 furnace upright and horizontal.

Attic hvac systems save space. An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan. An attic furnace is closer to the upper stories of a multi level home. Upright furnaces shall be permitted to be installed in an attic furred or under floor space exceeding 5 feet 1524 mm in height provided the required listings and furnace and duct.

30 inches high 762 mm 22 inches wide 559 mm 20 feet max length 6096 mm.