Harbor Freight 2HP Dust Collection Conversion Flanges

These flanges are used to convert a Harbor Freight 2HP DC to a Thein baffle with 6" exhaust and connector.
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updated January 27, 2025

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These flanges are used to convert a standard Harbor Freight 2HP dust collector into a Thein Baffle. The intake converts a 4" PVC to 5" to match the intake port on the unit.

The unit has the following characteristics/mods:

  1. Blower exhausts out the back of my shop with a 6" PVC pipe through a 6" flange mounted on the wall.
  2. The blower impeller was upgraded to a Wren impeller.
  3. The original flange on the blower was cut off and a 6" flange was added.
  4. The top of the baffle has a 6" flange
  5. A rectangle to 6" circle was created to convert the output of the blower to the 6" exhast.

In total the conversion uses: 1x exit flange, 1x input flange, and 3x 6" flanges.

Additionally I am using ball valve blast gates, 4" PVC, micro switches, and a LV SSR to control power on and off. 

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