How to Make a Better DIY Air Purifier

Hi folks! Here’s a minor improvement to one of the steps: it would be easier to find the center of the coroplast square by drawing diagonal lines from corner to corner and marking where they intersect: ☒. You don’t need to buy the T-square if you already have a straight-edge that can measure 2 feet. Thank you to @olsondotcasey for this suggestion.

This is the only video that mentions an EC fan. The noise reduction is a huge deal, thanks for that. PSA - Costco has great prices on Filtrete (3M) filters.

You can prolong the life of the filters by adding a pre-filter to catch large-particle dust, made of fine mesh window screen or nylon Noseeum netting that can be vacuumed or removed and washed.

Hot glue and different form factor. You’ve really contributed something to the air cleaner discussion on YouTube. I think your method is what I’ll use going forward.

A note about noise measurements: Because it's a log scale you can't do straight arithmetic for either addition or subtraction. You must first take the antilog of each number, subtract, then take the log. For example: 62 dB minus 29 dB background is still 62 dB, because the difference is so small it doesn't even register. If you had 36 dB and subtracted 29 dB, the net noise of the fan is 35 dB.

Amazing design and easy to replicate

Living on the west coast with all the wildfires right now, this will be incredibly useful!

Great design! I'm glad I was already subscribed to your channel! Thank you for the new better design and your research!

LOVE your design, clean looking, quiet, doesn't take a lot of space, affordable and best of all, it doesn't take various/miscellaneous tools (that most of us don't have anyway!) Thank You 🙂👍

Excellent how to! Thanks very much! Wishing you great success on your media adventures.

This is brilliant! I want to build one now..

Very clever. Sometimes the best designs a the most basic ones. I am definitely going to give this a try!

Thank you. Building mine as I type.

Great instructions. This is the least complication and beautiful I've see on you tube. I should have paid attention in geometry class. Who knew I would need it to make a circle for an air purifier one day.

I am in the middle of a ferocious dust storm in West Texas. How I wish I already had this built! (Rest assured, I will soon)! Thanks for a very elegant, quiet, long-lasting, and economical filter option.

Hi, I appreciate your approachable method. I've got one of those noisy box fans blowing on my woodstove and am looking for a quieter alternative. The box fan is powered by a thermostatically controlled power cord. This "works" because I leave the box fan turned on speed-1 and the thermostat triggers power once the woodstove is up to temperature. When the stove cools down, the fan shuts off. I love the setup but hate the fan! I'm wondering if the AC Infinity fan will retain its speed setting if the power is cut as I've described. Having to manually turn on or adjust the fan to a desired speed each cycle will not work for me. Thanks again!

I assembled my first air filter based on these plans today. It was my first time playing with a glue gun, cutting coroplast, and tying square knots. Overall it was a good experience and I can see making more in the future. The basic principles make sense so I feel up for experimenting with it. I used the same fan and 16 inch wide filtrete filters, though the tallest 16 inch wide ones Costco had were a third smaller at 16 by 20 and Merv 14. On the bright side I was able to get four Merv 14 filters for $45. On speed 1 I can forget the fan is on. I've seen some coroplast reviews saying one batch was much flimsier than another, and I may have gotten a flimsier batch as it was bending easily even before I added the fan to it, but resting on the filters and having the clothesline to stabilize it seems to work well enough. I may need to tighten the rope more. Getting the rope/clothesline through the narrow slits on the fan and tying it was the hardest part for me and I ended up using tweezers to pull it through. I might just unscrew the cage so I can get my hands in both sides of the fan cover next time. I'm much more used to zip ties. I might experiment with either a 2nd layer of coroplast or a sheet of 3/8 inch pvc, though I really like the overall simplicity of it as it is.

I really like that the chloroplast can be changed out to fit available filters. I get mine at habitat stores very cheaply.

Thank you.

Looks like we in Canada can only get a battery powered version of this Cloudlift fan. Also, 16 x 30 filters are hard to find. Seems like the most common are 16 x 25.