Circulate warm or cool air from 1 room to another using this Thru Wall Room to Room Fan 7-5/8 in. Transfer Fan. This fan's telescoping housing accommodates wall depths of 3-3/4 in. - 6-1/2 in. Equipped with 2-speed options, this fan allows you to adjust the air transferring power to quickly change or maintain temperatures in adjoining rooms. The fan's grille can be painted to match your interior style. Size: 6.5 In.