 So I want to show what the speed and the volume of air that the stock K40 fan can push. So I put this thing back together, just so I can do this. Turn on my animometer, put it in a few minutes. So, in a few minutes, it's 1791. So, if I do some math here, we need to take the area of that circle, which you'll notice is not a full circle. They cut off about a quarter of it to let this vent sit here. So this is solid right here, so no air is flowing through there. So we'll take our area of the four inches then, ties it by three quarters. So, we need to do pi, pi r squared. The radius of four in circle is two inches, which in feet is one-sixth. So we do one-sixth squared, which is one-thirty-sixth. And then we ties that by pi, which is pi. Alright, so we get, that's the area. So we take that number and times it by, well, we have 1791. Alright, so the stock K40 fan is pushing 156 cubic feet per minute, if it were four inch circle, but it's not. So let's times that by three quarters, or 0.75. So it's really pushing 117 cubic feet per minute. So here is the new fan with new housing. I'm just gonna hold together the tape for right now. But we got a portion down here to hold the motor. The actual fan housing, updated blade. You can see my multi-colored filament there. I ran out of black during the print. And the top. So I'm gonna get out of my animometer. Turn that on, feet per minute from this guy in. So I go this way. One divided by 36 times pi for our area. Times 1732. And now we're getting 151 cubic feet per minute. And because we have a four inch opening, that is our true volume that we're pushing. Not a portion of it because the opening is smaller. So you can move quite a bit of air with 151 cubic meter, cubic feet per minute. You can pay 25 bucks and get a 195 one-off Amazon of questionable quality. Or you can just take the one you got for free, print out some pieces and get some performance improvements. Just for comparison, I wanted to test out this other fan that I had ordered before I decided to try to salvage the K40 motor. So we'll turn it on and see what kind of volume it can push. Hope you can see that. 1811. 1811. So our 195, that's one other thing I should know, is that this is supposed to be a 195 cubic feet per minute fan. It is actually moving only 158 cubic feet per minute. So it's not much better than the fan that comes with the K40. So you might just be better off printing out these pieces and using that.