Genesis A1WINDOWFAN is a versatile window fan designed for double-hung, slider, and casement windows. It features adjustable expandable panels to fit openings from 24.4 inches wide and 13 inches high. The fan has three-speed settings and a temperature-sensing feature that automatically adjusts the fan speed based on the room temperature. It also allows you to set individual fan motors for intake or exhaust. With its easy installation and multiple adjustment options, the Genesis A1WINDOWFAN provides customizable ventilation to keep your home comfortable.