120 MM fan to 4 in tube
thingiverse
I needed a connector from a 120 mm fan to a 4 in vent hose. I used this for my greenhouse blast gate air control as well as my Martha mushroom fruiting tent. Hole pattern bolts directly to a 120 mm fan. You need to use stainless bolts in the mushroom tent or the nuts and bolts will rust very quickly. The hfanback file is for the inside of the Martha tent to hold the plastic tight to the surface.
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