We recently bought a house that had an addition put on in the 80's. The addition is on the back of the house and has separate (electric) heating and cooling. In the ceiling are two square, 12.75" air diffusers. Picture here:
The hole that it covers measures 12.75", but the actual cover seen here measures 17.5". The other thing is that I'm having a hard time finding different ones in this size.
Personally, I've never seen these used in residential, only commercial. And frankly, they're ugly. They're the first things you notice when you walk into the room. Is there an alternative that is more updated and more attractive that I'm not aware of? I would settle for the same thing, but one that doesn't drop down 3" or so from the ceiling (the more flush the better).