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A box fan with a HEPA filter stuck to the back of it has been proven to work reducing PM 2.5. The EPA seems to think they are OK: https://www.epa.gov/air-resea

A box fan with a HEPA filter stuck to the back of it has been proven to work reducing PM 2.5. The EPA seems to think they are OK: https://www.epa.gov/air-research/research-diy-air-cleaners-reduce-wildfire-smoke-indoors https://www.epa.gov/air-research/research-diy-air-cleaners-r... It's unreasonable for a box fan that can accept a standard filter on the back cant be sold. It's completely safe to use and not a scam at all. Buying this model means you don't have to duct tape the filters on. Also the model is designed to tolerate the extra load from the filter.

foofie 3y ago
> A box fan with a HEPA filter stuck to the back of it has been proven to work reducing PM 2.5. The EPA seems to think they are OK: You are free to MacGyver whatever you want. The moment you want to sell something you put together as a product that does something, you need to make sure that you are not defrauding the public. If your device really does what you claim it does, just subject it to tests to assure everyone.