The Dacor Raised Ventilation System... now you see it... now you don't. Press the button and the vent rises 8" above the countertop. Using a powerful blower, smoke and cooking fumes are efficiently captured and then ducted to the outside. Push the down button and the vent gently glides out of sight, resting beneath the counter surface when not in use. Designed for use with Preference and Millennia low-profile cooktops, whether your desire is an island, peninsula or wall setting.