The alpine hardware universal heavy-duty air conditioner support makes air conditioner installation easier, quicker, and safer. Eliminates the risk of dropping the A/C out of the window during installation. The AC bracket relieves stress on the window and allows for maximum sturdiness and weight allowance. Works with any brand-name air conditioner. Our bracket support eliminates exterior work with no drilling of outside walls or siding. Made of heavy-duty 13 gauge, epoxy-coated steel plate, for a lifetime of use. Fits windows with a minimum width opening of 16" (1ft 4in). Fits wall thickness from 3" to 12". 17” long x 16” wide A/C resting surface. The support will support A/C BTU ratings of 12,000 BTU 14,500 BTU 16,000 BTU 18,000 BTU 24,000 BTU 28,500 BTU 32,000 BTU. The window sill must be a minimum of 2 inches deep. The window sill must be able to accept (3) 2.5-inch long screws. Window sill thickness cannot exceed 12 inches-Sliding window lip must be no taller than 1 ⅜.