[teddy bear]

Filtering smoke from air is more than a merv 13 is designed for.
You need a HEPPA filter plus a a 5 gal. pail of activated carbon connect to a high pressure 6" duct fan. Ideal would be to make a window opening grill connected to the pail of activated carbon with 6" duct fan sucking on the charcoal blowing into the HEPA filter blowing into the home main area. This would keep out the smoke from infiltrating by pressurizing the home with well filtered, Particulate and combustion gases.

https://www.amazon.com/Premium-Virg...charcoal&qid=1600271419&s=home-garden&sprefix=bulk+activated+,garden,185&sr=1-7

Cut a hole in the both ends of the pail of charcoal. Connect a 6" starting collar to the lid end of the pail. You may need a course filter to retain the charcoal in the pail.

This is concept for an a/c tech fix up a max, low cost method to remove the pollutants in outdoor smoke.

Its something I might do as a simple temporary fix. Fortunately, no smoke at my house.

Keep us posted.
Regards Teddy Bear

 

[teddy bear]

Update: installed these filters and they are pretty effective for removing PM2.5 particles! It takes ~5 times longer than a regular air purifier with HEPA, but I got from 60µg/m3 to 9µ/m3 in our room.

What is the temp/%RH in the space and at the supply grills with the Merv 13 filters at peak cooling load?

We do not get much info on these types of units.

Regards Teddy Bear

 

[teddy bear]

I'm not sure how to test that. Subjectively it feels on-par with the previous filter, maybe a tad more humid (but that could be due to a foggy weather lately).
I'm not planning to use these filters after the sky clears up. My main goal was clean air.

Get a temp/%rh meter from Amazon for <$10. Hold it in front of the a/c supply and return for results. You should do this to see how well your system is working. The room target is 75^F, 50%RH with +-55^F, 89%RH on the supply.

Go info for us.

Regards Teddy Bear