Broan Elite Rmdd Downdraft System (Rangemaster?) Designed Specifically To Be Compatible With Most Conventional And Commercial Style Cooktops, Combines A Sensational Appearance With High Performance Features. Stainless Steel Construction On All Exposed Surfaces Provides A Durable Finish And An Unforgettable Look. (Insufficient Space For Built-In Ovens.) Features & Benefits Compact Design Is Installed Directly Behind The Cooktop For An Unobtrusive Appearance. (Not For Use Behind Ovens.) Thin Profile Saves Precious Space Under The Cabinet. Chimney Rises Over 9-1/2 Inches When Activated, Ideal For Large Pots And Pans. Infinitely Adjustable Control Is Designed To Provide Convenient Access To Govern The Blower Speed For Effective And Quiet Operation. Optional Remote Control Will Activate Down Draft From An Alternate Location (Rmddrbk Sold Separately) Dishwasher-Safe Filters Are Easy To Remove And Feature A Stylish Brushed Stainless Steel Appearance For A Professional Look. Unique Ducting Capability Allows The Internal Blower Connection To Be Ducted To The Left, Right Or Downward (From Left To Right). Heat Sentry Adjusts Speed Of Blower To High Automatically In Case Of Excess Heat, To Prolong Product Life. Compatible With Optional Broan Make-Up Air Dampers (Sold Separately) To Fit 6" Or 8" Ducting And Help To Balance The Air Pressure When The Range Hood Is In Use, Keeping Your Environment Comfortable. Models Rmdd3004Ex, Rmdd3604Ex And Rmdd4804Ex Offer You Choice Of Exterior Blowers Ranging From 600 To 1500 Cfm Or In-Line Blowers From 280 To 1100 Cfm (Blower Required And Sold Separately) 500 Cfm Internal Blower Is Included On Rmdd3004, Rmdd3604 And Rmdd4804 Models