Portable Air Filter

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Project by easiersaidthandone posted 05-09-2013 02:20 AM 12169 views 17 times favorited 11 comments Add to Favorites Watch

I have been wanting to make an air filter for a while. I couldn’t find a design that I liked until recently. The ones with multiple 1” filters and all the frames to hold said filters in place was more work than I wanted to put into this project. I finally found this one and knew that I had a design that made sense for me. So here it is. I originally wanted to hang it from the ceiling but this presented some major challenges. First I would have had to go up in the attic and sister some 2by lumber to my 1by rafters to have a strong enough place to anchor some eye screws. The second problem that I saw was that with the filter pointing downwards, some dust might fall out after turning the blower off that would pile up and then have to be cleaned up. So at the last second, I found some small casters in the drawer and put them on. Everything else is pretty basic just a 5/8” plywood box, biscuited together. The frame is made of window casing that is also biscuited and held on by a piano hinge and two draw catches. The filter is 20” x 25” x 4”. A 1 hour mechanical timer controls the motor.

11 comments so far

View Knothead62's profile


2600 posts in 3164 days

#1 posted 05-09-2013 10:53 AM

Nice design. Worth its weight in gold.
Me? I’m cheap! My wife saw one on TV that was made with a box fan, bungee cord and a furnace filter. Works great and it’s cheap… me.

View MasterSergeant's profile


1373 posts in 2891 days

#2 posted 05-09-2013 11:44 AM

I like this design, thanks for sharing!

-- Kelly, woodworker under construction

View JoeinGa's profile


7739 posts in 2210 days

#3 posted 05-09-2013 11:50 AM

Favorited, for when I’m ready to make my own

-- Perform A Random Act Of Kindness Today ... Pay It Forward

View jackthelab's profile


313 posts in 2896 days

#4 posted 05-09-2013 11:50 AM

Just what I was looking for to build. Thanks a million for sharing the info.

-- Dave in Minnesota - If it ain't broke, improve it!

View CampD's profile


1732 posts in 3689 days

#5 posted 05-09-2013 12:07 PM

I like!

-- Doug...

View OAKSPSD's profile


24 posts in 2168 days

#6 posted 05-09-2013 01:41 PM

I like the design, however where is everyone getting the furnace blower to make these. I have been keeping my eyes open but still not furnace blowers are coming up on my radar. I saw one plan where they bought a blower for attic venting but it costs about $100.00.

That fact that it is mobile is kind of different, in my case that is something I would like because I would use it for my small finish room and then removed it to the shop area to get it out of the way or to collect dust when sanding.

View Knothead62's profile


2600 posts in 3164 days

#7 posted 05-09-2013 01:57 PM

OAKSPSD raises a good question. Would an HVAC contractor be a source where they swap out a unit and have a useable blower assembly?

View Aristocraft's profile


87 posts in 2784 days

#8 posted 05-09-2013 02:11 PM

Great plan – I am in the process of building one now, so thanks for posting. If you will call HVAC company in your area, they will sometimes let you come pick a blower up for free. I called several and were told no, but then I hit on one that let me come pick one up – it’s looks to be brand new and works great! Also if you see a HVAC truck at a house, stop and ask if they have a ‘working’ blower, some will have one in their truck. The worst thing that can happen is no, but we all get no’s, just keep asking… good luck

-- --- Never a failure - Always a lesson

View Sanding2day's profile


1014 posts in 2050 days

#9 posted 05-09-2013 07:41 PM

Great design… Added to favorites, will likely use this! Thanks for sharing…

-- Dan

View Jerry's profile


221 posts in 3742 days

#10 posted 05-10-2013 12:54 AM

I have a friend that works for an HVAC company and he said most of those companies will give up the blowers out of old furnaces they have removed for free. I have gotten better than a dozen from him in the last year to build hanging air filters. Hope this comes in handy for someone.

-- Jerry - Rochester, MN *Whether you think you can or you can't, you are probably right* - Henry Ford

View easiersaidthandone's profile


82 posts in 2327 days

#11 posted 05-12-2013 02:42 AM

I am glad everyone enjoyed my air filter. Good luck finding a blower and building your own!

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