I am having a Trane XV90 TUY100R9V4W installed to replace an old gas furnace at my mother-in-laws house. The new furnace will be installed in an un-airconditioned laundry room at one end of the house.
My mother-in-law would like it if we don't have to cut a hole in the roof or wall for another pipe.
My question is, is it ok to take the combustion air from inside this room since the room is open to the outdoors by 2 wall vents.
The laundry room is about 9ft x 9ft, has two vent holes on an outside wall that are approximately 4 x 8 inches each with wire mesh and metal louvers (for cosmetics so they look good from outside). My guess is that this would make the air inside the laundry room to be at the same atmospheric pressure zone as the vent pipe.
This laundry room also has a gas water heater and electric clothes washer and dryer. The water heater has its own flue that is seperate from the heater flue.
Since there is approximately 64 sq inches of outside air, is it ok to take the combustion air from inside this room?
Would it reduce the effeciency to use this arrangement?
Thank you for your opinions, I really enjoy reading all the posts on this web site.