Comments on: 3 Ways to Get Cleaner Indoor Air With Filtration

By: Allison Bailes

Allison Bailes — Sat, 08 May 2021 12:30:22 +0000

In reply to Steven.

Steven, yes, it does work well that way, too. We’ve built several for our office and my home and have done them both ways. It changes the air flow patterns in the room but it still cleans the air.

Here are two articles written by Jim Rosenthal, who, I believe, is the first one to make a box with multiple filters to attach to the box fan:

https://www.texairfilters.com/a-variation-on-the-box-fan-with-merv-13-filter-air-cleaner/

And here’s a modification he came up with to improve air flow even more:

https://www.texairfilters.com/how-to-improve-the-efficiency-of-the-box-fan-and-merv-13-filter-air-cleaner/

By: Allison Bailes

Allison Bailes — Sat, 08 May 2021 12:19:06 +0000

In reply to Bruce Henry Glanville. That's a good way to distribute the clean air, Bruce! And it's great for houses where the system wasn't designed for high-MERV filtration.

By: Steven

Steven — Wed, 05 May 2021 17:20:51 +0000

Would this work as well with the airflow reversed?
I’m thinking if the unfiltered air is blown into the box and exits via the filters, any particles will accumulate on the inside, rather than on outside surfaces where they may be dislodged.

By: Bruce Henry Glanville

Bruce Henry Glanville — Tue, 04 May 2021 16:23:14 +0000

I place my box fan filter by the return so the system inhales cleaner airflow.