What is Reddit's opinion of Phresh Inline Filter, 6" 500 CFM Carbon Filter for Duct Ventilation Applications?

From 3.5 billion Reddit comments

Probably not the cheapest option, but you could use an inline filter outside of the tent, with just a couple inches of ducting routed inside the tent. I have one... it's quite a bit bulkier than the regular filters, but it does muffle fan noise a little.

Edit: and with an inline filter, if you ever decided to add a second tent, you could just add a duct wye, and exhaust both using a single fan & filter.

Those are super expensive because they have to clean it enough to be breathed directly. If you have the ability to vent outside you can use cheaper filters to remove the worst of the smoke and the reminants become a non issue. I do that with an inline carbon filter