HVAC Premium 8''w X 8''h 4-Way Aluminum Curved Blade Adjustable Air Supply HVAC Diffuser - Full Control Vertical/Horizontal Airflow Direction - Vent Duct Cover [Outer Dimensions: 9.65''w X 9.65''h]

I ordered three of these diffusers for my greenhouse evaporative coolers. They were easy to install; the flange of each fit perfectly into my 18” square ducts. The louvers are held firmly, easy to position, and do not make noise, even when the cooler is on high speed.

Really throws the air where you want it.

It installs very easily. The metal is sturdy though at the same time frágil. The edges bend somewhat easily if you’re not careful enough. The paint on the screws did not chip off with installation. Overall great look and versatility for air flow.

sturdy, well made. make sure your measurement are exact. some expected sizes may not be to the standard

Installed easily, but need to be careful not to over tighten the screws since it is aluminum and can deform. Fit perfectly and is a nice clean white, just what I wanted. I liked it enough to order 2 more to replace other old vents.

This is a really nice, low profile upgrade for traditional vents. The screws were not exactly in the same place as the originals, and the slider is hidde on one side. It seems like they restrict the airflow a lot less than traditional 2-way vents and let you better tailor where the air goes. In my case my vents are almost all in front of windows, so bling air inside instead of down helps cool the room instead of the windows.

It fits

The size is good but it has no the part to move de vents flow, only with the hands.

I had to return it as it did not quite work for what I needed.