Sirr0und Frost King Insulating Ac Sde Panels Insulating urethane foam panels reduce noise and vibration. Self-stick side channels included for new or replacement installation. Side panels will fit most window units. Cut foam panel and plastic channel to proper height and install. 2 side panels per package 9" W. x 18" H. x 7/8" T. Color: Charcoal. MPN# AC14H SKU# 266035UPC# 77578030784