Make Your Own Box Fan Air Filter

Bronze Tip Medal for All Time! 75 Tips

Make Your Own Box Fan Air FilterWith all the wildfires right now air quality has gone down throughout the west coast. Here's an easy way to make a room air filter out of a box fan and a furnace filter.


For best results use a HEPA filter with a MERV-rating of 13, an FPR-rating of 10, or a Filtrete MPR rating of 1000 or better. These are often advertised as "allergy" or "health" filters.

Total Time: 5 Minutes


Make Your Own Box Fan Air Filter
Make Your Own Box Fan Air Filter - box fan


  1. The idea is to mount the filter on the box fan so that it is on the air intake side of the fan. The motion of the air will pull the filter up against the fan.
  2. Make sure that the air is flowing through the filter in the proper direction. You want the arrow on the filter to match the air flow through the filter.
  3. You can use tape to secure the filter to the fan if you want. Or simply position it when you turn on the fan.
  4. If you use your filter for an extended time be sure to replace it regularly. Most furnace filters should be okay for about 3 months of use.
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  6. These kind of filters work best within a single room of your house with the doors and window closed. The air should recirculate in the room through the fan getting cleaner on each pass.

Note: Do not use this type of filter in an open window. It won't be able to filter enough smoke out of the air to make it worthwhile. Don't use the fan for an extended period. Check to make sure it isn't overheating. Don't leave the fan unattended. Turn it off before you go to sleep or leave the room. Don't use it in a bathroom or kitchen where it might get wet.

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Gold Post Medal for All Time! 523 Posts
September 15, 20203 found this helpful

I had this in mind but didn't follow through with it. So, I pinned an open weave material to the back of the fan. It works pretty well (for the larger airborne particles) and the material is washable but it's a pain fitting the material to the fan.


My original plan was to use a furnace filter but had no idea I would find one with the correct dimensions. On a list is some 14x20x1 filters for my HVAC. No that I know they make a size to fit a box fan, I'll be picking up some of those. too. Thanks, Fletch!

September 20, 20202 found this helpful

my son and daughter in love in Seattle did this! the smoke was making their throats scratchy and giving them migraines. they said it worked very well.


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