User Manual Alorair PureAiro HEPA PRO 770

It captures airborne particles and exhausts filtered air into the room it is placed in.You may vent to the outside if you goal is to reduce moisture in the filtered room, but it is not necessary.I use the unit to recirculate indoor air to effectively remove dust and odor.Remember, this not some wimpy filter system, you will have to tolerate some level of fan noise during operation.