Tempest - PC Fan Air Purifier Kit (US)

With that number of filters, I would seriously give thought to the long term cost (filter replacements). I’ve had several PC 6-fan boxes with 2 MERV 13 20”x20”x2” filters (original Canadian version of the Nukkit Tempest/similar to CleanAir kits) in my house the last couple years, including during a couple wildfire summers and those have kept PM2.5 down to single digit numbers at the worst times/under 1 majority of the time. The replacement cost is $10/filter. With 4 of these units, that comes out to $80/year.

That is actually completely false. There are several Corsi-Rosenthal Box builds that operate well under 45 dB while maintaining impressive CADR (Clean Air Delivery Rate). Here are a  few examples : * the Honeywell Build (via David Elfstrom): Using a Honeywell HF910 with 3M 1900 filters on speed 1, you get 422 CFM (Dust CADR) at 45 dBA. * The Rob Wissman Build: using 4x 3M 2200 filters and 9x Arctic P14 fans. It hits 556 CFM (Dust CADR) at 44.5 dBA. * The Tempest (Commercial/DIY Hybrid): Running P14 fans at an 8V voltage control setting with 2x AAF Flanders MERV 13 filters, I personally tested this at 184 CFM and only 33 dB (in a 30 dBA background that goes on 34,8 dBA) . Dust CADR 183,9 cfm

This is the way. I have one in every room. Have standard HVAC 16x25 filters which I pickup from Costco, far cheaper and way more surface area than any other option. Been considering upgrading to the Nukit Tempest, which essentially has a metal frame and takes 2" filters

I second this, also look in to the Nukit Tempest! PC fan purifiers are great, I’ve had mine for a year and love it.

Clean Air Kits, Nukit Tempest or DIY PC Fan CR Box. Generic filters: Yes. Furnace air filters, use whatever you want. Turn on after power cut: Yes.

AirFanta 3Pro is a good unit with a high CADR, tho not the quietest. If you can do a Nukit Tempest, that would be a very quiet unit with a great CADR.

I own a luggable and it’s alright, but it doesn’t seal without tape. Huge pain in the ass to change the filters. If using furnace filters is the priority for you, then you could also consider the Nukit Tempest, but I wouldn’t buy another one of these types unless I needed a high CADR unit that needed to be absolutely silent. They are expensive for what they are

Nukit tempest is way bigger of a pain in the ass to change filters in my personal experience (I have both)