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Box fan adapter to 4-inch pipes and ducts

by inhale3d, published

Box fan adapter to 4-inch pipes and ducts by inhale3d Jan 15, 2013

Description

Variations on a 4" box fan adapter to round, 4"-ish exhaust or vent pipe, spouts, and flanges

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Thanks for the info!

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.

What size fan do you use with this? 120mm?

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Instructions

I have a Full Spectrum laser cutter and had a monster 2HP dust collector for exhaust, but the dust collector was so loud I could hardly hear anything when it was running.

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.

Comments

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dhulihan on Nov 26, 2013 said:

What size fan do you use with this? 120mm?

inhale3d on Nov 26, 2013 said:

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.

LiquidBeef on Jun 2, 2013 said:

Searched for this for my new toy from FSL. Good to see! How have these two fans held up over the past 5 months? Was considering just using a shop vac with a HEPA filter in it as long as the garage door is open.

inhale3d on Jun 13, 2013 said:

I've been very happy with the solution so far. Fans are still running fine. I thought maybe they'd clog up with particulates, but so far, still going strong.

cmceezee on Jan 31, 2013 said:

I made something similar a long time ago but out of acrylic before I had my 3D printer!! Nice work!! I needed to calibrate an air-flow sensor. http://grabcad.com/library/air...

inhale3d on Jan 16, 2013 said:

Yes, I had a dryer vent installed through the side of my shop wall to vent outside. The flexible pipe connects to the box fan on the laser and the other end connects to a box fan attached to the dryer vent/egress. There is a bit more odor than when I had my 2HP dust collector on it, but it's tolerable and worth the noise reduction I got by going to the box fans.

stevecooley on Jan 15, 2013 said:

I just got my gen5 hobby advanced laser a couple of weeks ago and I'm now struggling with what to do about the fumes. Hard to jump into projects until I can get this sorted out. So are you just venting outdoors?

LiquidBeef on Jun 2, 2013 said:

Nice to find folks with the same laser. I'm setting mine up right now. What sort of ventilation system did you end up going with?

inhale3d on Jan 16, 2013 said:

I had a dryer vent installed through the side of my shop wall to vent outside. The flexible pipe connects to the box fan on the laser and the other end connects to a box fan attached to the dryer vent/egress. There is a more odor than when I had my 2HP dust collector on it, but it's tolerable and worth the noise reduction I got by going to the box fans.

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