Abstract: A ventilation fan unit for causing air flow with respect to a room having a ceiling, the room designed for occupancy by a person. The fan unit has a fan unit housing mounted in the ceiling and having an air vent on a room facing surface of the fan unit housing for drawing air from or delivering air to the room. A replaceable panel is provided with a first surface and a second surface, the replaceable panel is removably attachable with the room facing surface of the fan unit housing by way of coupling between the replaceable panel and the fan unit housing so that the replaceable panel can be removed and replaced with another replaceable panel attachable to the fan unit housing by way of the coupling.

Abstract: An exhaust and filtration assembly includes: a housing; an exhaust vent configured to guide unfiltered air out of the exhaust and filtration assembly; a filter assembly configured to filter air and guide the filtered air out of the exhaust and filtration assembly; an exhaust assembly configured to direct raw air from an entry port of the exhaust and filtration assembly and direct air out of the exhaust vent without the air having been filtered; and a controller comprising computing logic configured to control so that only one of air filtration and raw air exhaust occurs at any given time.