Exhaust vents for cooking area
An opening of at least 8065 mm2 (12.5 in2) in cross-sectional area (minimum dimension 50 mm [2 in]) and located above the appliance(s) or mechanical equipment installed in accordance with the manufacturer's instructions shall be used to ventilate the area where the propane cooking appliances are located. Ducts from metal hoods shall be installed to preclude trapping of products of combustion. All ducts shall extend through the wall or roof to the outer air