Ommercial kitchen design professionals were concerned that the minimum exhaust air ductwork velocity of 1 500 fpm 7 62 m s as required by the national fire protection association nfpa 96 1 was too restrictive.
Kitchen exhaust hood velocity. The engineering design hvac team re ceives the kitchen equipment informa tion from the kitchen designer equip ment supplier. As a safety measure minimum allowable exhaust flow requirements are established to ensure that contaminated effluent is exhausted to ensure a safe condition. 25 water wash type exhaust hood a type i hood which uses water to remove accumulated grease from the grease extractors. Mua too cold or too hot can create an uncomfortable working environment.
Exhaust hoods exhaust fans makeup air units and packaged rooftop hvac heating ventilation air conditioning units all need to. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Ducts serving type i hoods shall be constructed of. Mua air velocity impacts the ability of the hood to capture and contain cooking effluent.
The 500 fpm velocity maintains or improves the safety aspect of minimizing grease buildup while allowing engineers more flexibility in both retrofit and new kitchen design that include variable flow kitchen exhaust systems. Factory built commercial cooking recirculating systems 3. Kitchen ventilation system starts when. The exhaust hood efficiency can be further improved by adding side walls.
Commercial kitchen exhaust hoods shall comply with the requirements of this section. Exhaust hoods velocity air volume. Hoods shall be type 1 or type 2 and shall be designed to capture and confine cooking vapors and residues. Ashrae tech nical committee 5 10 kitchen ventilation sponsored and provided project guidance for a recently completed research.
Type i exhaust ducts shall be independent of all other exhaust systems except as provided in section 506 3 5. Ul standard 710 test standard for kitchen exhaust hoods. Commercial kitchen duct systems serving type i hoods shall be designed constructed and installed in accordance with sections 506 3 1 through 506 3 13 3. Factory built commercial exhaust hoods which are tested 2.
Campanas de extracción de volumen de aire de velocidad. Fundamentals of kitchen ventilation the exhaust serves the purpose to capture and contain the effluent and. Kitchen hoods are evaluated for structural integrity after subjected to intense fire.