Lasko FF305 Air Flex Fan – The Air Flex Air Purifier and Room Fan is both a premium box fan and powerful air cleaner in one. Unlike most box fans, which can overheat or break down when used with a filter, this fan was specifically engineered to work with a filter to powerfully clean the air in your room while providing a cooling breeze. Additionally, this portable fan was designed to stand up to tough use with durable construction, UV color protection paint, and a Weather-Shield motor for worry free window use. The fan comes with a standard pleated filter that is rated to remove dust, smoke, and pollen from the air so allergy sufferers can breathe easier and feel more comfortable at home. Easily customize your clean air by using any standard 20 x 20 x 1-inch filter, available at home stores. Features steel body construction, premium fan blade for maximum air flow, ergonomic control knob, easy carry handle, and Lasko’s patented safety fuse technology. Made in the USA from domestic and imported parts.