We have four warm air outlets in the basement with no cold air returns.
Is floor level hvac return air required in basement.
Fail to do this and you ll never have a warm basement.
This pulls the air across your body.
Then subtract the percent of outside air from each return air grille airflow in the system as calculated above to find the required adjusted return airflow.
Worse than inefficient the approach of taking return air from a basement or crawl space utility area where gas or oil fired heating equipment is located can be dangerous in particular if by the location of the new return air opening draws flue gases from a nearby draft hood or barometric damper or if the heating equipment is.
In some installations a central return duct and grill is installed in a central location to reduce cost this has become the norm but is only to save costs.
His logic was that this would force the system to suck more warm air from the top floor air returns.
I have an air conditioner attached to my furnace and it works well but it mostly cools the basement and the main floor while my upstairs floor is still too warm.
One other caution is to have the cold air.
My brother suggested using magnetic vent covers to cover my basement air returns.
A friend who used to install furnaces told me to cut a return in the cold air return to the furnace near the floor.
By putting the cold air return on the floor it will vacuum up the cold air on the floor and draw down the warm air from the ceiling.
You determine a return grille pressure zone required 340 cfm of return.
So turn the cold air return 90 degrees through the wall so that it actually draws the air from the room next to the furnace room or from the hallway of the basement.
This is why cold air return ducts must also be installed at floor level ideally on the opposite side of each room from the heating ducts.
If the supply ducts are in the floor then the return air should be located up high.
The return air vent openings need to be on the opposite side of the room so the conditioned air is pulled across the room.
If the supply ducts are high or in the ceiling then the return air ducts or grills should be low on.
We have a 1 440 square foot basement under a full two storey home heated with a high efficiency gas furnace.
Return ducts deliver air back to the furnace for re heating and if they re not located near the floor you ll get cold pockets of stagnant air.
