Came across this deal on Grainger this morning, I ordered 1 and thought many some others could take advantage of it. https://www.grainger.com/search?searchQuery=3zw32 $10 for a 165 fuselink fire damper is a deal. I will be using this to blow cold air down from an upstairs room to the room my insert is in through the ceiling. I will get a computer fan and put it on top of this so it should be pretty quiet. Hope this helps you guys get compliant with fire codes and be safe.