The Lasko Air Flex(tm) room fan and air purifier is both a premium box fan and a 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, the 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. This 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. It features steel body construction, a premium fan blade for maximum airflow, an ergonomic control knob, an easy carry handle, and Lasko's trusted safety fuse technology. 2 year limited warranty. 2-in-1 powerful box fan PLUS air purifier Comes with MERV10 / 42 CADR pleated air filter Customize your clean air and cooling with any 20 x 20 x 1 inch filter available at home stores. Cleans pollen, dust, and smoke from the air Premium box fan with powerful, Weather-Shield motor for worry-free window use Specially-engineered motor for use with an air filter Durable steel body construction and tough, UV-protected paint for tough use 3 energy-efficient speeds and top-mounted ergonomic control knob Ideal for workshops, bedrooms, garages, and more Hand wipe. Model FF305.