That's my point they're really not worth it and as soon as the charcoal evaporates you have to buy a new one. Putting a fan in the window will do the same thing you don't need a filter the filters are used if you don't have ventilation. Then people put them on a fan and circulate the air in the room.
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OK, so your method would be to vent the room and circulate it at the same time? I just want to clarify so that I can get the two window fan units.. I already have a box fan so I am
good there....