Kitchen Exhaust Hood Flow Rate

As a safety measure minimum allowable exhaust flow requirements are established to ensure that contaminated effluent is exhausted to ensure a safe condition.

Kitchen exhaust hood flow rate. Q air volume flow m 3 s y distance between table and exhaust hood m c circumference of the hood m 1 can be modified to calculate air volume flow. Kitchen hoods are evaluated for structural integrity after subjected to intense fire. Florida residential code 2014 15 exhaust systems m1503 range hoods m1503 3 kitchen exhaust rates jump to full code chapter where domestic kitchen cooking appliances are equipped with ducted range hoods or down draft exhaust systems the fans shall be sized in accordance with section m1507 4. In the exhaust also affects the particle deposition rate.

Determine the recommended ventilation based on your kitchen s size. Schlieren images at different exhaust rates design considerations hood type wall mounted hoods function effectively with a lower exhaust airflow rate than island hoods. The hvi recommends that your range hood should be capable of cycling the air in your kitchen completely 15 times per hour. Total kitchen exhaust airflow greater than 5000 cfm must limit each hood s exhaust flow rate.

Can be operated at a lower exhaust rate than an unlisted hood of comparable style and size over the same cook line. Lower exhaust rates may be proven by labora tory testing with specific hood s and appliance lineup using the test protocol described in astm standard f 1704 test method for performance of commercial kitchen ventilation systems. Kitchen hood types. While an exhaust hood serves that purpose the key question is always.

The answer always depends on the type and use of the cooking equipment under the hood the style and geometry of the hood itself and how the makeup air conditioned or otherwise is introduced into the kitchen. Start by measuring the floor area of your kitchen. Q 2 v 1 y 2 c 1a example kitchen exhaust hood. Performance of kitchen exhaust hoods fig.

Island hoods are more sensitive to mua supply and cross draft than wall mounted hoods. In a rectangular shaped room this can be done by multiplying the width and length. Ul standard 710 test standard for kitchen exhaust hoods. Multiply ing the deposition velocity by the concentration before and after a change in exhaust flow rate provides the mass flux to the wall in each case which allows for quantitative comparison.

What is the appropriate exhaust rate. For discus sion purposes the situation with constant aerosol concentration. The capture efficiency of a kitchen exhaust hood which equals the ratio of the fan exhaust flow rate to the total plume flow rate at the front canopy height as shown in equation 1 is a performance index of the hood 5. If the kitchen designer specifies.

6 5 7 1 4 a kitchen dining facility with total kitchen exhaust airflow greater than 5000 cfm must meet one of the following energy saving requirements.