Kitchen Exhaust Duct Velocity

And better from annex a explanatory material.

Kitchen exhaust duct velocity. A 8 2 1 1 ashrae research project 1033 rp final report effects of air velocity on grease deposition in exhaust ductwork documented that grease deposition is reduced as air velocity is reduced. The exhaust duct should be liquid tight and pitch back toward the dishwasher. Total and static losses are equal. For instance an appliance may be found to operate effectively with reduced exhaust volumetric flow rate while maintaining capture and containment.

If the effluent emis sions and exhaust duct size remains the same the result will not only be a decrease in exhaust velocity but a corresponding in crease in particle concentration. Air flow and velocity due to natural draft air flow volume and velocity due to stack or flue effect caused by indoor hot and outdoor. Constant cross sectional areas. 8 2 1 1 the air velocity through any duct shall be not less than 152 4 m min 500 ft min.

Duct to slope up in direction of flow for grease flow back to hood. Static and velocity pressure are mutually convertible. Without adequate ventilation and an ample supply of clean makeup air no kitchen will operate efficiently. Ducts serving type i hoods shall be constructed of.

500 1000 1500 2000 mean duct velocity fpm bottom. Air return intakes sizes and capacities size and capacity of air return intake. Duct access panels every 3 metres of straight duct and change of direction. 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.

Type i exhaust ducts shall be independent of all other exhaust systems except as provided in section 506 3 5. Fundamentals of kitchen ventilation a. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. The magnitude of each is dependent on the local duct cross section which determines the flow velocity.

Commercial kitchen exhaust hoods shall comply with the. Air ducts friction loss diagram a major loss diagram for air ducts imperial units ranging 10 100 000 cfm. Ashrae energy efficient kitchen design author. Test results duct velocity 0 0 0 2 0 4 0 6 0 8 1 0 1 2 1 4 1 6 1 8 deposition flux µg ft min.

The following pressure changes are affected in the ducts. Ventilation systems for ventilation and air handling air change rates ducts and pressure drops charts and diagrams and more. Exhaust ductwork should be stainless steel below the kitchen ceiling and either stainless steel or aluminum above the ceil ing. Diverging sections increase in duct size.

Kitchen exhaust ductwork construction of 1 2mm or 0 9 stainless as per as1668 standard with seams sealed to prevent grease leakage. Spigot connections at 5 to 7m s. Course content introduction ventilation is the single most important factor in the design construction and operation of commercial kitchens.