This product works as billed. It opens when powered, and closes when the power is shut off.
However, it looks and is cheaply built.
For starters, I had to remove the damper and straighten it by bending it back in shape and placing a couple of washers on the damper bar to shim it and make it close properly against the cheap foam weatherproof strip. Then I had to carefully peel off and reapply the weatherstrip against which the damper rests when closed. It was put on crooked. It's a cheezy setup.
When looking to purchase a motorized damper, I reviewed the different products on line and chose this one because it was $20 to $30 cheaper. Their are not a lot of options for a 4" motorized damper.
The more expensive dampers looked to have a better weatherstrip design, as well as a smaller motor. Some seemed to incorporate a flange inside the vent, against which the damper firmly rested. Not just a dinky piece of foam crookedly slapped on the inside.
But in the end, it cost me more for this product, because I had to purchase the 24 volt transformer, which cost me $27 dollars at Radio Shack. This is important to consider.
In the end, had I bought one of the better designed dampers, I would have paid less, because they ALSO provided a transformer in the package.
This damper is doing the job ok for me, I'm just saying that there are probably better designed products out their for the same money.
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