Unit installation
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Spring Air System Enviro Engineering Manual 01/0315
15
The external static pressure is made up of many components.
Here are a few to consider:
a)Spring Air Kitchen exhaust hood - typically between 0.5 to 1.5” W.C. (0.13 to 0.33 kpa)
Calculated by Spring Air.
b)Exhaust inlet ductwork from the hood to the KES-ISH filter box.
c)Internal Static Pressure of KES-ISH filter box - typically between 2.0 to 3.5” W.C. (0.50 to 0.88
kpa). Calculated by Spring Air.
d)Exhaust ductwork from the KES-ISH filter unit to the KESF fan unit. The minimum allowable
velocity is 1500 fpm (7.6 m/s).
e)Exhaust discharge ductwork from the KESF fan unit to atmosphere.
f)Exhaust discharge cowl (Typically 0.25” W.C.) (0.06 kpa).
KESF Fan Chart
Horizontal Arrangement, DWDI fan
15,000 CFM to 40,000 CFM
External Static Pressure (“W.C.)
*
KES CFM
1.50 2.00 2.50 3.00 4.00
HP RPM HP RPM HP RPM HP RPM HP RPM
120 12000 13.8 1746 15.0 1805 16.3 1862 17.5 1919 20.2 2029
140 13000 13.8 1722 15.0 1779 16.2 1835 17.5 1890 20.1 1997
140 14000 16.5 1830 17.8 1883 19.1 1936 20.4 1987 23.2 2089
160 15000 16.9 1827 18.2 1879 19.5 1930 20.8 1980 23.6 2079
160 16000 19.9 1929 21.2 1978 22.6 2026 24.0 2074 26.9 2167
180 17000 18.4 1557 20.0 1606 21.6 1654 23.3 1703 26.7 1796
180 18000 21.3 1632 23.0 1679 24.6 1725 26.4 1771 29.9 1860
200 19000 21.5 1629 23.2 1675 24.9 1721 26.7 1766 30.2 1853
200 20000 24.5 1700 26.2 1744 28.0 1788 29.8 1831 33.5 1915
240 22000 22.8 1366 24.8 1409 26.9 1452 29.0 1494 33.4 1576
240 24000 28.3 1467 30.5 1507 32.7 1547 35.0 1586 39.6 1662
280 26000 28.8 1470 31.2 1512 33.5 1550 35.8 1588 40.61 1662
280 28000 35.0 1570 37.4 1606 39.8 1642 42.3 1677 47.3 1747
320 30000 32.5 1280 35.1 1316 37.8 1352 40.4 1387 46.0 1456
320 32000 38.3 1351 41.1 1385 43.8 1419 46.7 1452 52.5 1518
360 34000 35.9 1081 38.9 1115 42.0 1148 45.2 1181 51.7 1246
360 36000 41.4 1134 44.6 1166 47.8 1198 51.2 1229 58.0 1290
400 38000 48.5 1195 45.2 1165 48.5 1195 42.0 1286 58.7 1286
400 40000 47.9 1183 51.2 1213 54.6 1243 58.1 1272 65.3 1329
* The above chart includes internal static pressure of the KES-ISH, and KESF fan unit. The chart is for a
DWDI exhaust fan in a vertical or horizontal arrangement either indoor or outdoor design. For other
selections call your local Spring Air Systems representative. “External Static Pressure” above must include
items a, b, d, e & f.
Chart No. 2
Once the exhaust volume and external static pressure have been calculated refer to the KES
FAN CHART. The charts above include the KES-ISH and KESF internal static pressure. Move
down the CFM column to the KES model that corresponds to the exhaust air capacity. Continue
across to the External Static Pressure column. Read the fan RPM and brake horsepower.