This unit is 27" deep and has a stainless panel on the back to direct all suction to the front, where it matters most. The BBQ lid will not obstruct any airflow like with most typical range hoods.The Twister-BBQ 36" Range Hood boasts an impressive 1200CFM of power and durable stainless steel construction. It includes dishwasher safe baffle filters to trap grease and odors, making it the ideal range hood for all types of cooking. This unit comes with mechanical rotary switches, making this range one of our most reliable models. Designed, assembled, and certified in Canada for long lasting, problem free service. We offer a 5 year parts warranty on this model. This model can be used with a 10" duct (1200CFM) for a quieter and more efficient operation. Air discharge direction is top vented but we also offer a back vent option for direct rear exhaust.