502.6 Dry Cleaning Plants
Type IV and V dry cleaning systems shall be provided with an automatically activated exhaust ventilation system to maintain a minimum of 100 feet per minute (0.51 m/s) air velocity through the loading door when the door is opened.
Q = 100 × ALD (Equation 5-1)
Q = Flow rate exhausted through the hood, cubic feet per minute.
ALD = Area of the loading door, square feet.