All chimney enclosures must maintain the required minimum air space clearance of 2 50mm to the chimney.
Minimum clearance for furnace attic.
Municipalities may require a minimum of 30 clear inches in front of the furnace which can be accomplished in a small room if the door to the room opens in front of the furnace.
This 20 limitation applies to the minimum 30 height only low clearance attics.
Where the height of the passageway is less than 6 feet the distance from the passageway access to the furnace shall not exceed 20 feet measured along the center line of the passageway.
If you want to purchase a mid efficiency furnace for your home then the price profile for the equipment is similar with a downflow model compared to an upflow one.
Attic hvac systems save space.
So why put an hvac system up in the attic at all.
The 2012 international residential code requires an attic access opening for attics with an area greater than 30 square feet and a vertical height in excess of 30 inches.
Provide a permanent receptacle outlet and a lighting fixture near the furnace.
30 inches high 762 mm 22 inches wide 559 mm 20 feet max length 6096 mm measured along the center line between the attic access opening and the attic furnace.
Passageway if headroom is less than 6 ft attic furnace minimum 30 in deep and wide in front of furnace access by an opening as large as the largest piece of furnace and in no case less than 22 in by 30 in located in a hallway or other readily accessible location light switch attic furnace electrical receptacle and light fixture minimum 24 in wide solid.
Well mainly it s a way to save space.
An outdoor unit which houses the fan condenser and compressor and an indoor unit which holds the evaporator and fan.
If required by installation instructions install sheet metal cover on platform beside access panel.
The cost profile for a furnace in the attic is competitive.
Typically for gas furnaces there must be a minimum of 24 front accessibility to the furnace and any access door or panel must have enough clearance space to permit removal of the largest component in the equipment.
The rough framed opening.
Where height restrictions will not permit the use of the attic insulation shield an enclosure from the attic joist to the roof joist will be sufficient.
Most updated central air conditioned homes have a new air conditioner split system meaning the ac is broken up into parts.
Minimum clearances from combustibles shall comply with the listing of the appliance.
Expect to pay around 1 000 for the equipment along with another 1 000 to install it for most geographic locations.