Box fan adapter to 4-inch pipes and ducts
by inhale3d, published
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Hi Dave, the fan I used had holes about 105.5mm on center. The outer perimeter was around 118mm. If you load the STL files up in a CAD tool or viewer, you could check each of them for yourself to see if it'll work for you. Have a great week.
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The specs for the laser cutter said the exhaust needed to be 60-100CFM and I had two box fans that were each 140CFM so decided to replace the loud dust collector with two 4" box fans. The problem was putting a fan inline with a 4" outlet of the laser and 4" pipe and exhaust vent to the exterior.
So, I made some adapters that bolt onto either side of the fan and are various sizes of inner and outer diameter to fit various situations around 4" pipe. I added one box fan directly in front of the exterior exhaust vent tube and one directly out of the laser cutter. The two working together move plenty of air to suck out laser cutting vapors and smoke. The beauty is it's much quieter than the 2HP dust collector.
The fan mounting holes are sized for #6-32 but M5 bolts will thread into the holes nicely, too.
The following STL files have various inner and outer diameters and slightly different shapes. #1 has set screw holes already positioned on the flange.
-1.stl has an inner diameter of 4", outer diameter of 4.4" and is good for go over a 4" OD flange such as on the Full Spectrum laser cutter
-2.stl has inner diameter of 4.2" and outer diameter of 4.4"
-3.stl has inner diameter of 3.792" and outer diameter of 4.2"
-4.stl has inner diameter of 4" and outer diameter of 4.4" - the tube is longer than the -1.stl but otherwise similar shape and size.
With these four sizes it's quite easy to bolt on the adapters you need for various 4" vent pipe problems.
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