You've probably at one time or another seen
				a version of a box fan air filter.
Woodworking Tips Index
Box Fan Filter

You've probably at one time or another seen a version of a box fan air filter. But recently while shopping at the local home center, I came across some vinyl siding J-channel. (Its normal use is for trimming around doors and windows.) I found it could be used for mounting furnace filters to box fans much easier.

The advantage to this design is that it firmly holds a 20" x 20" furnace filter, yet it allows for easy and quick removal of the filter for cleaning or replacement.

Start by removing the plastic grill.Then attach the channel to the grill, using some narrow wood backing strips to screw into. I did this to three edges of the inlet side of the fan, like you see in the top photo. Finally, replace the grill back on the fan.



 

Box Fan Filter


Box Fan Filter
Standard vinyl J-channel is available
at most home centers in the siding section.
 
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