VIVOSUN 8 Inch Air Carbon Filter Odor Control with Australia Virgin Charcoal for Inline Fan, Pre-filter Included, Reversible Flange 8" x 22" Grow tents, cupboards and cabinets. Anywhere without a roof/ceiling cavity to displace extracted air into. Air-cooled lighting. Lower-level floors of double/triple story houses. Window to window ventilation applications. Hot or cold &#034;filtered air transfer&#034; from one air conditioned room to another.