4 ms·

Not sure, but I'd think it would also help to keep your fan clean.

• 9wzYQbTYsAIc 8y ago
  I’ve actually built this fan “mod” and when I change out the filter, I’m going to try attaching it to the back instead. With the filter thoroughly taped to the front (nearly airtight), there’s a large amount of blowback. I suspect that this is reducing the overall efficiency of air filtration.
  • jhenkens 8y ago
    With it taped to the back, you don't get blowback, but there is significantly reduced airflow out the front. I used a filter of this type for ~2 weeks during the Thomas fire. Worked very well, though the proper filter I received from Amazon a week after I built this worked better. Two is better than one, though!