The cold air return grate for my central heating system is 13.5" (front to back) x 23.5" (along the wall). Can I put a piece of furniture (piano) over the back 7" of the grate (with no clearance underneath), so I'm left with 6.5"" x 23.5" How much would it help if I put the piano 2" above the grate?
Thanks
Mickey
Thanks
Mickey