Box-Fan Filters & DIY Purifier Parts reviews (3 models)
3 box-fan filters & diy purifier parts rated from 5 Reddit owner comments across r/AirPurifiers, r/AirQuality, r/HVAC, r/HomeImprovement, r/CaliforniaFires. Sorted by overall score.
Filtrete 16x20x1 Air Filter
3.6 (3 owner comments)
$27.99 (price as of 2026-11-07)
“I do something like this, except I simply taped a 20 x 20 x 1 Filtrete MPR 2800/MERV 14 filter to the back of a each of two of box fans.”
Read review →3.5 (1 owner comments)
$48.35 (price as of 2026-11-07)
“I did not find this fan loud like the Lasko to begin with but as the filters got to one year the noise did start getting louder assuming it was having”
Read review →Air King Box Fan
2.8 (1 owner comments)
$68.74 (price as of 2026-11-07)
“That Air King moves a lot of air!”
Read review →CA Fire Supplies is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.