Title: Heat yes, but melt no.
Review: Got the product promptly. Placed one of the covers over the top half of one of the 2 hot air vents. Ran the heater off an on for several hours as usual. Got a little more hot air into the living room (as opposed to the hall) just as hoped for. But the next morning I noticed about an inch and a half of one corner of the new vent cover had curled up. These things are way too flimsy. Maybe if your hot air isn't very hot (has a longer run through the house before getting to the vent - mine is only about a 3 foot run) this could be for you. But I am disappointed.
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