Sorry, I don't remember where I learned this from, but someone noticed that there is quite a gap between the fan and the cage on the stock exhaust fan. Adding a nut decreases that gap and hopefully improves efficiency of the fan.
Had to trim the top of the fan to screw the plastic cap in.Nut was just a bit too tall. I had to shim the cover with two cardboard pieces so the fan would clear the cover.
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