I built this based on a Shop Hacks air filter shootout and Jay Bate's cart build. It's not pretty as it's was a test.... I was doubtful it would actually work. Frankly, I was so shocked at how well it performed I added a controller, a better fan (the one shown) and walnut banding.
With this cart running I can keep my shop air as clean as my living room air. This was verified in tests using a Dylos DC1100 Pro laser particle tester. If you are looking at improving your air filtration, I highly reccomed searching Shop Hacks shootout and Jay Bates cart on youtube.
Notes: the fan I used is not explosion proof. If not comfortable with electrical use the controller as is. Read up on brushed vs brushless motors as brushless motors require a different method of speed control.
Parts:
-4x FPR10 furnace filters $68
-18 Inch industrial wall mount fan $60
-Vivosun variable vent fan speed adjuster $18 (optional)
-Powertec 3-Inch poly casters $20
-Home ctr outdoor electrical box $10 (optional)
-Various scrap bin wood
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