OK,forced air oil furnace. There's a rectangular duct running back under one part of the house. Feeds to two rooms,the toy room and our bedroom. It feeds two round ducts,one goes left to the bedroom,feeds one register,the other goes the other way to a register in the toy room,then the rectangular duct goes straight through to another register in the toy room. I keep the door closed to the toy room,so I had both of those registers closed in there. I haven't been able to get any heat out of the one in the bedroom for several years. The other day,just totally on a lark,I opened the one directly opposite it on the round duct in the toy room and danged if the one in the bedroom didn't start blowing hot air!
Now why the heck wouldn't it blow being the only one open? You'd have thought it would have had so much air flow behind it that it would have blown the register right out of the floor. No more cold draft coming across the floor out of the bedroom either.
Now why the heck wouldn't it blow being the only one open? You'd have thought it would have had so much air flow behind it that it would have blown the register right out of the floor. No more cold draft coming across the floor out of the bedroom either.