The Tjernlund AireShare™ Room-to-Room Transfer fans distribute air from one conditioned space to another. Virtually every home has a room that is uncomfortably hot or cold from which some of that room's air can be shared with an adjacent room, making the temperature of both rooms more comfortable. The AireShare™ transfers air through the wall cavity created between two wall studs. The AireShare's unique option of moving the air up or down within the wall cavity allows for optimum heat transfer between rooms. In addition, locating the Grille and Diffuser, one high the other low, prevents the transfer of light and sound between these adjacent rooms.