Room Air-Filter: Dumb filter + K&N HVAC (reusable merv 11) + Programmable Outlet Device = Low cost and reliable. Submitted by joshpit2003 t3_11psv0u on March 12, 2023 at 11:04 PM in BuyItForLife 14 comments 48
rpmerf t1_jc1lc5g wrote on March 13, 2023 at 11:31 AM The cheapest is a 20" box fan and a 20" x 20" filter. The recommended way is 4 filters taped together, cardboard bottom, box fan on one side. https://cleanaircrew.org/box-fan-filters/ Permalink 2
Room Air-Filter: Dumb filter + K&N HVAC (reusable merv 11) + Programmable Outlet Device = Low cost and reliable.
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