Own one of those room sized plug in air purifiers? Sick of paying $10-$100 per filter? We were too, so we decided that we could save money and get a better filter.

HEPA Filters are made for clean rooms and easily clog up in a home environment. After reading many studies done on filters, we've concluded that getting a furnace filter is the best choice. Today there are plenty of sub-micron grade furnace filters, and luckilly for us, they are all priced based on micron size (so get the biggest one you can with the highest filtration rating possible.)

Also doing this seems to create a better air path (blocks off any cracks that air can bypass the filters with, as they are usually designed to do - as HEPA plugs up and that'd wear the motor out.


Step 1: Materials List

You'll need:
-A "flat" filter based air cleaner, technically any of them work that I've tried (all of them were holmes brand but others seem like they'd work)

-Allergen grade furnace filter (all of them are priced by how small of particles they filter, not by size. GET THE BIGGEST ONE of the rated filtration you desire to use)


-Duct tape


-Tape Measure

-Card Board

-Gloves (to keep your hands from getting cut on the mesh)

<p>Hi, I was wondering, if I use something like the 3M Purple 1500 Filtrete, do I need an activated carbon pre-filter? Also on my HEPA Panasonic machine, they place the deodorant filter (it's really a black carbon filter) after the HEPA filter(!). Any ideas?</p>
<p>The pre-filter traps the bigger particles, and thereby extends the life of the HEPA filter. Therefore it makes sense to always use the pre-filter.</p>
My new car has a "cabin filter." I want to do something like this to replace that filter, too. Thank you.
Mine does as well. I cut out the edge piece of the filter, and it works beautifully.

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