Suncourt ZoneMaster Fully Adjustable Motorized Airflow Control Zone Damper, UL Listed 24VAC/20VA Plug-in Transformer Included, Compatible with Any 24 Volt Thermostat, Normally Open – 8", Silver

Works as described. Includes a plug-in power supply but not the wires to connect the damper to the supply. The device is NOT UL or ETL listed (only the power supply is). When open the device consumes no power. When closed I measured a power consumption between 7.9W and 8.4W (8.1W average).

Work great, cheap price and made in the USA

I haven't installed these yet and therefore haven't used them but I did wire them up and test them. After some needed modifications right out of the box I think they should work fine. I bought three of these 8" normally open. On all three of them, when the damper was fully closed the damper did not seal with the foam seal properly. There was anywhere from 1/4" to almost 1/2" gap between the foam seal and damper. I was concerned with a gap, there would be a whistling sound due to the air flowing through the gap when the HVAC was on and the damper closed. I ended up pulling off the foam seal, applying some rubber cement and moving the seal into a better position that created a proper seal between the closed damper and the foam material. Now there is no gap. It wasn't much work to do it and I think it'll hold but no product should need modifications right out of the box to work properly.

Works just as expected with the foam gasket around edge of the valve virtually eliminates leakage

Direct replacement works good