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Snare the dust without going bust

The replacement filters for my ceiling-mounted air filter are an odd size and rather expensive. I tried at several home centers to find a reasonably priced filter the same size to no avail.

Instead, I found that a standard 12×25×1" filter fits nicely on the outside of the filter cabinet. To hold the filter in place, I made a few brackets that hold rectangular rare-earth magnets (woodmagazine.com/rectanglemagnet). Each magnet comes with a steel U-channel that fits into dadoes in the brackets so the magnets sit flush. A couple of screws secure the assembly to the bracket. The magnets snap to the top and bottom of the filter cabinet, holding the filters in place. I stack three filters together, so I made the brackets long enough to support all three.  
—Matt Lynch, Wichita, Kansas

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