The F40000 Series provides installation flexibility with 4-way convertibility to fit virtually all applications. The hood is designed for under cabinet use and installs as 3-1/4 x 10 in ducted opening with vertical or horizontal ducting or 7 in round vertical ducting or as non-ducted with air recirculation. The hood features a fan designed for years of trouble-free service, an easy to clean grease filter, a protective lamp lens that distributes light evenly over the cook-top and control switches for fan speed and light activation.Polymeric blade and light lensWashable aluminum filterConverts to non-ducted by removing cover plate from front of hood and installing the non-ducted filterMitered sides and hemmed bottom for safety and good looks