Fresh air is required.
Gas furnace louvered door.
Note if a louver is used than this will decrease the size of the opening.
Therefore the above would reqiure 100 sq inches.
Electric furnace no combustion.
Combustion air can be drawn from adjoining spaces.
Sometimes the door is sealed but a pipe comes into the closet to supply combustion air and that s ok.
Insufficient combustion air need outside air or a full louvered door or a standard door with high and low vents.
Door furnace 20 x 78 5 finished opening size 20 5 x 80 5 free air space 238 sq.
This is where ventilation become important not the ventilation of the furnace itself but the ventilation of the closet space.
Door furnace 22 x 78 5 finished opening size 22 5 x 80 5 free air space.
White finish is electrostatically applied baked on enamel.
Sometimes there is a small grill in the floor that some goof covered up with a piece of carpet that was not ok.
Do not install your furnace in a storage closet.
The heat that the furnace radiates may lead to a fire hazard.
For a gas or oil furnace a louvered door or a pipe to supply combustion air is required.
A louvered door has horizontal slats for venting if the door is fully louvered over its entire surface then this will work as long as the combined input rating of the gas appliances is less than 175 000 btu hr.
You can connect the furnace room to the rest of.
For a 100 000 btu furnace gas fired or oil fired than a 50 square inch fresh air vent is required.
Single panel full louvered doors.
If you don t want to or can t use a louvered door here are your other options.
Insufficient clearance need metal door or fireproof door to reduce clearance requirements.