AireShare™ Level-to-Level Fan ASLLMove air from Level to Level. This unit can either blow air up to a higher level or, when installed in the opposite orientation, down to a lower level. Move stove or fireplace heat up or down a level or move cool air from a basement up to the main living space. The Tjernlund ASLL can be hard wired into the wall and can be activated by switch on unit or wired with a wall switch or thermostat. Grilles are included. 75 CFM, 25 Watts. ASLL Literature ASLL