Bought a bunch of these to use in replacing vent covers for a central air add on in a victorian. They are very solid and well built. But due to the weight and safefy concerns with mounting these on the ceiling, I ended up removing the louvers and mounting just the face to the existing damper in the ceiling for the AC vents. Now what were unsightly AC vents look like the were there since the day the house was built. In short, these look great and are built like a tank!