The bracket works with single or double hung windows between 24 and 38 inches wide (does not work in slider; crank out or casement windows). The bracket needs 10 inches of clearance below the window The bracket requires a minimum wall thickness of 4 inches and maximum wall thickness of 11 inches. The dimension is taken from the inside lower window frame to the exterior sill or exterior surface (siding and masonry; etc. ) if no sill exists. Installs in minutes and requires no fasteners; hardware; tools or drilling. Tested for maximum load capacity of up to 200 lbs. 2 year warranty. ACTUAL PRODUCT DIMENSIONS (NOT GIFT BOX) INCHES: Min: 24" x 15.25" x 11.5" Max: 38" x 22.25" x 11.5" ACTUAL PRODUCT WEIGHT (NOT INCLUDING GIFT BOX) POUNDS: 10