Abstract: An air purifier comprises a housing that comprises an intake opening for an inflow of air and an output opening for an outflow of air, a fan, a motor for rotating the fan, a sleeve configured to at least partially surround the fan and/or the motor, an air purifier unit, and a retainer assembly. The air purifier unit is mounted in the housing purifying air flowing through the housing and is operatively coupled to the sleeve. The retainer assembly is configured to retain the air purifier unit in the housing and with respect to the sleeve. The retainer assembly comprises a retainer and an actuator operatively associated with the retainer and the sleeve, wherein movement of the actuator from a first position to a second position moves the retainer to securely retain the air purifier unit in the housing.

Abstract: A low-profile air purifier comprises a housing that includes a pair of plates opposing one another, an intake opening and an output opening; a toroidal fan rotatably mounted in the housing between the plates, an axis of the toroidal fan being essentially perpendicular to the plates; a motor disposed in a central opening of the toroidal fan for rotating the toroidal fan; and a filter mounted to the housing for filtering air flowing through the housing. The present patent application also discloses a modular wall section that comprises an internal frame; an air purifier mounted within the internal frame; and a panel mounted in the internal frame for movement between an open position for accessing the air purifier and a closed position concealing the air purifier. The air purifier of the modular wall section may have similar configuration as the above discussed low-profile air purifier.