Circulate warm or cool air from 1 room to another using this Thru-Wall Pro Room to Room Fan. Hardwired unit is often used in conjunction with PTAC units mini-splits fireplaces wood stoves window air conditioning units and other heating and cooling systems. Telescoping housing installs in frame walls from 4 in. to 6-12 in. thick. Variable speed fan allows you to adjust the air transferring power to quickly change or maintain temperatures in adjoining rooms. The fans grille can be painted to match your interior style.Features. Rotating grille allows airflow direction to be changed for comfort.. Hardwire.. Includes Template.. Adjustable variable speed fan Airflow range is 40 CFM at lowest speed to 110 CFM on highest.. Quiet operation.. Sones 3 and dBA on high 55 on low less than or equal to 49.. Cutout dimension 11.5 x 8.5 in.. Back grille diameter 10 in.. Dimension 13 x 6 x 10.75 in.