Permanent gravity ventilation openings of not less than 2 square feet (0.2 m2) net free area opening shall be terminated directly to the outside of the building or extend to the outside of the building by continuous ducts.
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Each hood shall be connected to a gravityventilation duct extending in a vertical
direction to outside the building. This duct shall be of
the same ...
Spaces, or portions of spaces, to be naturally ventilated shall be
permanentlyopen to operable wall openings directly to
the outdoors, the openable ...
systems shall consider the relatively high specific gravity of the vapors. Where natural ventilation is used, adequate openings in outside walls at floor ...