Air Filter

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Forum topic by agallant posted 01-12-2011 10:00 PM 847 views 1 time favorited 3 replies Add to Favorites Watch
View agallant's profile


520 posts in 2311 days

01-12-2011 10:00 PM

So I am going to make my own air filter. I ordered 2X20 inch box fans and was going to build a housing for them. my question is does the housing do anything to the airflow? It would be easier just to tape 20X20 filters to the front of the fan. Has anyone done this?

3 replies so far

View NBeener's profile


4808 posts in 2598 days

#1 posted 01-12-2011 10:03 PM


Lots of us.

I have one or two 3M Filtrete filters AND a whole-house HEPA filter bungee cord-tied to my 20” box fan.

Works great. Sits on my sanding table. Gets used WHILE I’m sanding.

Also … it’s on a timer. Comes on at about 1am, and runs for about 2hrs, while I sleep ;-)

-- -- Neil

View rieferman's profile


39 posts in 2116 days

#2 posted 01-12-2011 10:15 PM

I just built something like that. I used a 4” hepa filter and it doesn’t tax the fan much at all. I use some shims to really get a good seal between the fan and filter. I can place a sheet of paper a foot away and it’ll suck right up against the filter. Clean air exhausts to the ceiling and back into the room. I leave it on low all the time, and turn it up to medium or high depending on the task at hand.

-- New to woodworking, old to barn fixin'

View dbhost's profile


5590 posts in 2656 days

#3 posted 01-12-2011 10:26 PM

3M Filtrete Ultra Allergen filter duct taped to the intake side of a box fan is what I used for a long time… I recently upgraded to a full on overhead air filter, there is no comparison. The box fan trick works, but it is really weak…

-- My workshop blog can be found at

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