The Alpine Hardware universal medium-duty air conditioner support makes air conditioner installation easier, quicker, and safer.FEATURES:-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 wall or siding.-Made of heavy-duty 13 gauge, epoxy-coated steel plate, for a lifetime of use.SPECIFICATIONS:-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 holds up to 200 lbs - 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.Requirements:-Window sill must be a minimum of 2 inches deep.-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