Mark's Locksmith

This is a 20 inch Box Fan with 4 - 1 inch x 20 inch x 20 inch (Merv 8, Merv 11, or Merv 13) Air Filters.

I made it so that you can replace one filter at a time without removing any tape. All you have to do is un-clip the filter and replace it with a new one.

I have been wanting to make this for years but had other things to do. I use it everyday, a few hours a day, fan setting on low. I have Merv 13 air filters.

What you will need is:
1 - 20 inch x 20 inch x 3.5mm cardboard for the bottom
1 - Lasko Air Circulating 20 INCH Box Fan, White (Amazon.com)
1 - Aerostar 20 inch x 20 inch x 1 inch, MERV 13 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size: 19 3/4" x 19 3/4" x 3/4") (Amazon.com)

Print:
8 - Corner Box Fan Air Filter.stl (4 for the top and 4 for the bottom corners)
8 - Slide Clip Box Fan Air Filter.stl
4 or 8 - Bottom Clip Box Fan Air Filter.stl (it holds the cardboard)
2 - Top Left Box Fan Air Filter.stl
2 - Top Right Box Fan Air Filter.stl

This works GREAT!!

Videos:

20 inch Box Fan Air Filter Kit - 3d printed

20 inch Box Fan Air Filter Kit - putting on the top holders

I used: PETG, Settings: Hotend: 240 degrees C, Bed: 90 degrees C, Temp Glass Bed, infill: 50%, Print speed: 40 mm/s

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How to Make a DIY Air Filter | Ask This Old House
https://www.youtube.com/watch?v=aw7fUMhNov8