CjDA. Vent grilleB. Filter support tray (non-removable)C. Removable grease filterD. Ceramic glass topThe downdraft ventilation system consists of a vent cover, filterand vent fan. The downdraft ventilation system removes cookingvapors, odors and smoke from foods prepared on the cooktop.IMPORTANT: For optimal performance, operate downdraftventilation system with the filter properly installed.To avoid the buildup of grease, the filter should be cleaned often.For more information on proper filter placement and cleaning, see"Downdraft Ventilation System" in the "General Cleaning"section.To Use:Turn vent fan knob to LOW, MED (medium) or HIGH. Turn vent fanknob to OFF when finished cooking, or when the cooktop is notin use.MedHighOFFWhen canning for long periods, alternate the use of surfacecooking areas, elements or surface burners between batches.This allows time for the most recently used areas to cool.• Center the canner on the grate or largest surface cookingarea or element. On electric cooktops, canners should notextend more than 1/2"(1.3 cm) beyond the surface cookingarea or element.• Do not place canner on 2 surface cooking areas, elements orsurface burners at the same time.On ceramic glass models, use only flat-bottomed canners.For more information, contact your local agriculturaldepartment. Companies that manufacture home canningproducts can also offer assistance.IMPORTANT: Do not leave empty cookware on a hot surfacecooking area, element or surface burner.Ideal cookware should have a flat bottom, straight sides and awell-fitting lid, and the material should be of medium-to-heavythickness.Rough finishes may scratch the cooktop or grates. Aluminum andcopper may be used as a core or base in cookware. However,when used as a base they can leave permanent marks on thecooktop or grates.Cookware material is a factor in how quickly and evenly heat istransferred, which affects cooking results. A nonstick finish hasthe same characteristics as its base material. For example,aluminum cookware with a nonstick finish will take on theproperties of aluminum.Use the following chart as a guide for cookware materialcharacteristics.COOKWARE CHARACTERISTICSAluminumCast ironCeramic orCeramic glassCopper •Earthenware •Porcelain •enamel-on-steel or castironStainless steel •• Heats quickly and evenly.• Suitable for all types of cooking.• Medium or heavy thickness is best formost cooking tasks.• Heats slowly and evenly.• Good for browning and frying.• Maintains heat for slow cooking.• Follow manufacturer's instructions.• Heats slowly, but unevenly.• Ideal results on low to medium heatsettings.Heats very quickly and evenly.Follow manufacturer's instructions.Use on low heat settings.See stainless steel or cast iron.Heats quickly, but unevenly.A core or base of aluminum or copperon stainless steel provides evenheating.