Holmes Dual Blade Window Fan with Comfort Control Thermostat (HAWF2041-N)

Holmes Dual Blade Window Fan with Comfort Control Thermostat (HAWF2041-N): Dual blade window fan with water-resistant motor 3 speed settings let you choose your ideal comfort level Comfort control thermostat Dual blade operation with independent electronically reversible motors for intake, exhaust and air exchange Fits most double-hung and slider windows Window vest fan comes with adjustable extender screen and extender panel for larger windows Backed by a 3-year limited warranty It measures 13.3"H x 24"W x 6"D