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mike[_22_]

On 1/18/2013 9:32 PM, wrote:
No leaks and there are plenty of other vents that can handle it. But I plan to close it in the winter.

Since the duct runs through an uninsulated attic and down an outside
wall, in the winter some cold air

drops through the duct into the room. That's the reason I want to be
able to close the vent.

My bad...I was confused by
I have a 4X10 air conditioning vent in my dining room ceiling. It's
adjacent to an outside wall, about a foot from a corner.

I have some "vent cover" stuff that looks like a huge sheet of
refrigerator magnet.
Works great on the floor vents. Not sure if the magnetic material is
strong enough
to hang on the ceiling vent.