CleanAirKits - Luggable XXL

You also have the option of buying a smart plug and plugging a dumb air purifier into it. If you do, I find that the plugs that work with the “Smartlife” app have more scheduling options. Just make sure that your purifier doesn’t have to be turned on via a switch/button on the purifier itself or the smart plug won’t work with it. My CleanAirKits Luggable and DIY CR Boxes work great with smart plugs, but my Honeywell HPA304 doesn’t.

Your best bets are: * Cheap solution: Build a [box fan air purifier](https://www.reddit.com/r/crboxes/comments/1hi3z6h/portable_box_fan_air_purifier_with_shroud/). It's just as effective as some commercial products that are at least 10 times more expensive. * Quiet solution: Buy a Brisk Box Kit, Tower of Power, or Luggable product from [Clean Air Kits](https://www.cleanairkits.com/). Furnace filters are so much more cost effective than the special proprietary filters used by commercial air purifiers.

Air purifiers based on box fans or PC fans compensate for the lower filter efficiency per pass with more passes per hour. MERV 13 furnace air filters are much more cost effective than HEPA filters. A combination of competition and economies of scale hold down the prices of furnace air filters. Commercial air purifiers use special proprietary filters, which are expensive due to limited production and the manufacturer's monopoly. Worse yet, production of these filters is subject to discontinuation.