What Kind of HEPA Filter Should I Buy for My DIY Air Purifier?

The good news is, HEPA filters are incredibly simple technology, and should be available locally from many home depot stores. We recommend you look for a HEPA filter with the following traits:
1. Bigger than the surface of your fan, so that no air leaks around the fan
2. Pleated, to provide a larger filtration surface
3. Has a rigid frame to ensure it remains in shape.

MERV Filters:

MERV filters – also sometimes called furnace filters – are also a good option for DIY purifiers. They have a lower filtration efficiency than HEPA filters, but meanwhile let more air through. Overall, they can give very good filtration performance. Read more: why are lower grade filters more effective at filtering the air.

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