Single Griddle preset for the Commercial Kitchen Hood Sizer: light duty. Pre-filled inputs Cooking Line Length 1.2, Appliance Type griddle, Hood Type wall-canopy.
Pre-filled Inputs
Exact preset input values
Cooking Line Length
1.2
Appliance Type
griddle
Hood Type
wall-canopy
Duty Level
light
Duct Velocity
500
Governing Formulas
Engineering formulas used by this calculator
Expression
Result
Q = L × D × V
Exhaust airflow (cfm)
Q_makeup = Q × 0.8
Make-up air (cfm)
V_duct = Q / A_duct
Duct velocity (fpm)
H_hood = L + 2 × overhang
Hood length (ft)
Frequently Asked Questions
How is commercial kitchen hood exhaust airflow sized?
Exhaust airflow is the hood length times the capture depth times the duty-based face velocity; NFPA 96 sets the minimum face velocity by cooking duty.
How much make-up air does a kitchen hood need?
Make-up air is typically sized at about 80% of the exhaust airflow so the kitchen stays slightly negative without starving the hood.
What duct velocity is required for a grease duct?
NFPA 96 requires a minimum grease-duct velocity of 500 feet per minute to keep grease entrained and prevent build-up on the duct walls.