Retractable downdraft hood rises from behind the cooktop and retracts when not in use, offering a seamless design for your kitchen, Chimney rises over 9-1/2 inches when activated, ideal for large pots and pans, Models RMDD3004EX, RMDD3604EX and RMDD4804EX offer you choice of exterior blowers ranging from 660 to 1620 Max Blower CFM or in-line blowers from 320 to 1540 Max Blower CFM (blower required and sold separately), Easy-to-use rotary control lets you adjust the fan speed, Dishwasher-safe filters are easy to remove and feature a stylish brushed stainless steel appearance for a professional look