This 30? gas cooktop includes Downdraft, an integrated ventilation system that doesn?t require a separate hood. The cooktop features a 17K BTU professional burner to achieve both high heat needed for searing and low simmer settings. The 5K BTU Even-Heat? Simmer Burner enables precise simmering and melting while the 300 CFM exhaust rating means the venting can handle it all. FREE SHIPPING TO THE CONTINENTAL US ONLY Box was opened on top, but contents have never been removed, used or installed Downdraft ventilation integrates the ventilation system into the cooking surface so that a separate hood is not needed - smoke and odors can be removed and taken outside or filtered and recirculated inside 17K BTU Professional burner provides the ability to use high-temperature cooking methods such as searing, stir-frying , and wok cooking as well as low temperatures suitable for simmering 5K BTU Even-Heat? simmer burner - a diffuser plate allows more control of the flame at the lowest setting, for more precise simmering and melting 300 CFM exhaust rating handles the venting requirements of high temperature cooking techniques like pan searing and stir-frying 3-speed fan control can be precisely matched to cooking needs, effectively removing steam, grease, and odors from the air 15K BTU Burner reaches temperatures needed for searing and quick boiling Convertible to duct-free ventilation - allows a downdraft cooktop to be placed nearly anywhere in the kitchen using a duct-free conversion kit (sold separately part #JDA7000WX) Melt cap - melt chocolate or butter, simmer delicate sauces, or poach eggs on a low-power burner, thanks to a wider burner cap that shields and diffuses the flame to produce a gentler, low-power heat Electronic ignition and automatic re-ignition lights burners with an electric spark instead of a pilot light - for more reliable performance, burners are relit if the flame is blown out