[birken]

I've been running a similar setup next to my litter box for about 2 years using "Vivosun" products, which seem like a cheaper knockoff version of Terrabloom.

The Terrabloom stuff looks higher quality and I can't compare it directly to Vivosun, but I've got no complaints about my Vivosun duct fan or carbon filters. I'm not necessarily suggesting one brand over the other, but just to add that you can run a knockoff version of this setup for a lower cost.

[ornornor]

I’m trying to picture the systems. They’re basically a carbon filter sandwiched by two fans, it runs the air through the filter and puts it back in the room? Or is it connected to a vent that exhausts the air outside (or does it filter one coming outside air?)

[runnerup]

In my case, a fan sandwiched by two filters. Recirculates through room so filtration will follow the differential equation models for “CSTR’s”, which are Constantly Stirred Tank Reactors.

[TheBlerch]

Which Vivosun products do you use and how large is your space? Is there a HEPA filter in the system, or only carbon?