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Thread: Portable Shop Filter

  1. #1
    Supporting Member markfitz's Avatar
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    Apr 2016
    Phoenix, AZ
    Thanked 57 Times in 13 Posts

    markfitz's Tools

    Portable Shop Filter

    Portable dust filter for the shop made from 20" box fan and furnace filter.

    Front view:
    Portable Shop Filter-filter-1.jpg

    Back view:
    Portable Shop Filter-filter-2.jpg

    View from the rear with door open and filter removed:
    Portable Shop Filter-filter-3.jpg

    This is slightly more upscale than the classic design, which consists of a furnace filter duct-taped to the back of a fan. Highlights of the project:

    - 20" box fan found at the local Goodwill store for $3
    - Remove the fan assembly, wiring, and switch
    - Cut the fan mounting brackets from the fan box
    - Save the front grill and discard the rest
    - Make a new body out of 1/2" MDF 21.5" x 21.5" x 7.0"
    - Starting with a 20.5" square piece of 1/2" MDF, cut out a 19.5" dia. hole
    - Mount the fan assembly in the box. I had to mount the switch inside the box and made an extension of the switch shaft to attach to a knob on the outside.
    - Mount the piece with the big hole just in front of the fan blades. This significantly improves the performance of the fan.
    - Make a frame to hold a 20" x 20" x 1" furnace filter and mount it behind the fan assembly.
    - Cut pieces of 1/2" thick stick-on window sealing foam rubber to the frame surface that the filter will rest on.
    - Place the filter in the frame and measure the distance from the back of the filter to the back side of the box. Add about 1/8". Make a 19.5" square frame from 1/2" wide material that height.
    - Make the frame for the rear door frame from 2" wide 1/2" thick material. I used poplar.
    - Glue the small frame to the inside of the door frame (centered). This clamps the filter in place when the door is closed.
    - Mount the door using hinges and clasps.
    - Mount the front grill.
    - I added a handle on the top made from the finest wood (a chunk of 2 x 4) and it is ready for some paint.

    I used a furnace filter that was washable. It cost $20, but I figured that was a lot cheaper in the long run than buying new filters every few weeks. It filters the air nicely and is still usable as a portable fan.

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    Last edited by markfitz; Mar 16, 2018 at 04:17 PM. Reason: Try to cleanup bullet list

  2. The Following 4 Users Say Thank You to markfitz For This Useful Post:

    PJs (Mar 18, 2018), rlm98253 (Mar 17, 2018), suther51 (Mar 17, 2018), Toolmaker51 (Mar 18, 2018)

  3. #2
    Content Editor
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Thanked 1,628 Times in 1,459 Posts

    Thanks markfitz! We've added your Portable Shop Filter to our Miscellaneous category,
    as well as to your builder page: markfitz's Homemade Tools. Your receipt:

  4. #3

    Join Date
    Mar 2018
    Thanked 3 Times in 2 Posts
    How do you keep your workbench so neat????

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