18-28-507.13.4 Low temperature.
   The minimum airflow for Type I hoods used for low-temperature appliances such as medium-to-low temperature ranges, roasters, roasting ovens, pastry ovens and appliances approved for use under a Type II hood, such as pizza ovens, shall be determined as follows:
 
Number of exposed sides
Formula
For SI:
4 (island or central hood)
Q = 75A
Q = 0.38A
3 or less
Q = 50A
Q = 0.25A
Alternate formula
Q = 50PD
Q = 0.25PD