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Food Service Installations AIR BALANCE TEST EXHAUST HOOD FILTER CALCULATIONS a 05/11/2015 To: Jeff Wong, R E H S On the above day I performed an air balance test for a Hood for Raimond Narvasian @ Wingstop Restaurants @ 2640 Reynolds Ranch Pkwy 4100 in Lodi, CA 95240 fx The Hood that was tested is a(ETL)ND Captive Aire Hood measuring 12' X 4.0'with a total of(8)Kleen Guard filters which are rated at 100 to 800 CFM per filter. We fiave (16"*20")with a usable average area of (1.73 SF)each with a total filter area for this hood of }i 15.57 square feet. I found the average FPM flowing thru these filters was(3,128/9/ 1.73 = --,202.8 FPM per filter which is with in the stated range stated above. The average air flow t* (CFM)thru each filter, in this hood, is 347.5 CFM. This particular hood is design rated to operate @(12.0)Length x 250 CFM per filter which equals 3,000.CEM. The(ETL)ND hood has a minimum required air flow of(12.0) length x 2000 FPM_ 2,400,but can operate efficiently at maximum air flow as high as required by the UMC code at 100A which is(12.0) length x 400 FPM per foot, which would be 4,800 CFM IF THE EXISTING DUCT CAN ACCOMADE IT. This hood is operating slightly(4%) beyond the design range of the Captive Aire ETL. This Hood average FPM is(202.8 FPM)X(Net filter area of 1.73)=(346)times the number of fil- ters(9)=3,128+/-5%CFM. The duct size,on this hood, is 16"RND=201.4 square inches divided by 144 equals 1.4 square feet of duct area going to the roof The average CFM exhaust- ed by this hood is thru this duct 3,128 CFM/ 1.4= 1,984 FPM which is within the UMC range of 1500 to 2500 FPM per foot. The duct is within the 2 foot of centerline as required by ETL and is Fire Wrap as required.NO 90's were visible on the hood as it makes it way out of the building. The return air for this hood was @ 3,004 CFM+/- 5%which was returned thru(1)P S P Hood mounted diffuser( 16 * 156/ 144)= 17.3 Sq. Ft. of diffuser. This calculates out to be 3,004/ 17.3 = 173.64 FPM average on the diffuser opening,which is with in Captive Aire standards of no more than 300 FPM per square foot. P q The total percentage of make up air is : 3,004/3,128=96.0%+/- -5% 1966 Tice Valley Blvd--.Suite#142 THIS HOOD IS CERTIFIED TO WORK AS REQUIRED Walnut Creek,CA 94595 B-799587 OFFICE(51 O)701-7368 FAX (925)935.7860 David j. Mancini FSINSTALLATIONS @AOL.COM Ventilation Consultant to Food Service Installations (799487)