6" 150mm duct fan air intake bell mouth
thingiverse
This is a bell-mouth air intake duct to help reduce intake noise. It has an internal diameter of 152mm to fit the intake of my 6 inch duct fan which can shift 500 cubic meters of air per hour. External diameter is 230mm to fit my build area which limited me from putting a decent lip on it. I make no claims for performance as I designed it by eye on tinkercad which is hard to do smooth curved surfaces with. I estimate it has reduced the noise of my duct fan by about 50%, or at least it seems that way to me.
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