I had an electrical forced air heating/cooling unit that I replaced a couple of years ago with a gas unit. However I kept the original duct systems intact with no changes.
The original ductwork has a return air register located in a corner of my kitchen floor. The other return air openings are located on my second floor along the wall. Two openings along the wall about 6 in. by 24 in through the same wall cavity.
I would like to redo my kitchen floor, but the floor opening for the return air is in the way. Can I just block this opening and rely on the return air opening from my second floor?
How can I calculate or estimate how much return air opening is needed for the system? Can I just take more return air from the basement where the unit is located ? or just add an opening on the main floor of the same wall with the return air on the second floor?
Thanks.