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Spring Air Systems
REV LOW
Engineering Manual Revision 2.0 -021902
17
Hood Width: Island
REV LOW
The hood width should be equal the depth of the largest appliance from the wall plus allow for an
additional 12” (305 mm) overhang from the front of the appliance. Each hood should be a
minimum 54” (1372mm).
REV LOW
Exhaust Volume Vs Exhaust Duct Size
Exhaust
Volume
Duct Collar Size
Exhaust
Volume
Duct Collar Size
CFM l/s
W x L
in x in
W x L
mm x mm
CFM l/s
W x L
in x in
W x L
mm x mm
450
212
10 x 4
254 x 102
3500 1652 10 x 33.5
254 x 851
500
236
10 x 4.5
254 x 114
3625 1711 10 x 34.5
254 x 876
625
295
10 x 6.0
254 x 152
3750 1770 10 x 36.0
254 x 914
750
354
10 x 7.0
254 x 178
3875 1829 10 x 37.0
254 x 940
875
413
10 x 8.0
254 x 203
4000 1888 14 x 27.0
356 x 686
1000 472
10 x 9.5
254 x 241
4125 1947 14 x 28.0
356 x 711
1125 531
10 x 10.5
254 x 267
4250 2006 14 x 29.0
356 x 737
1250 590
10 x 12.0
254 x 305
4375 2065 14 x 30.0
356 x 762
1375 649
10 x 13.0
254 x 330
4500 2124 14 x 30.5
356 x 775
1500 708
10 x 14.0
254 x 356
4625 2183 14 x 31.5
356 x 800
1625 767
10 x 15.5
254 x 394
4750 2242 14 x 32.5
356 x 826
1750 826
10 x 16.5
254 x 419
4875 2301 14 x 33.0
356 x 838
1875 885
10 x 18.0
254 x 457
5000 2360 14 x 34.0
356 x 864
2000 944
10 x 19.0
254 x 483
5125 2419 14 x 35.0
356 x 889
2125 1003 10 x 20.
254 x 508
5250 2475 14 x 36.0
356 x 914
2250 1062 10 x 21.5
254 x 546
5375 2537 14 x 36.5
356 x 927
2375 1121 10 x 22.5
254 x 572
5500 2596 14 x 37.5
356 x 953
2500 1180 10 x 24.0
254 x 610
5625 2655 14 x 38.5
356 x 978
2625 1239 10 x 25.0
254 x 635
5750 2714 14 x 39.0
356 x 991
2750 1298 10 x 26.0
254 x 660
5875 2773 14 x 40.0
356 x 1016
2875 1357 10 x 27.5
254 x 699
6000 2832 14 x 41.0
356 x 1041
3000 1416 10 x 28.5
254 x 724
6125 2891 14 x 42.0
356 x 1067
3125 1475 10 x 30.0
254 x 762
6250 2950 14 x 42.5
356 x 1080
3250 1534 10 x 31.0
254 x 787
6375 3008 16 x 38.0
406 x 965
3375 1593 10 x 32.0
254 x 813
6500 3067 16 x 39.0
406 x 991
1.
If exact exhaust volume is not indicated use duct size closest to required exhaust.
2.
Model B water wash hoods and dry extractors have 1.5” W.C. (0.38kPa) for exhaust
flow rates from 90 to 450 CFM/ft (140 to 700 l/s/m)
Chart No. 5
Make Up Air/Supply Air
Introducing fresh air back into the kitchen is generally recommended as good engineering
practice. The amount of make up air should not exceed the total exhaust to maintain a negative
pressure within the kitchen. Inadequate amounts of fresh replacement air will result in cold
drafts, hot spots, poor hood smoke capture and generally uncomfortable working conditions
within the kitchen and uncomfortable environment in the dining room for the customers.
One excellent method of introducing makeup air is through a make up air plenum built into the
ventilator. SPRING AIR SYSTEMS has two optional make up air arrangements; MP and MC.
Directing the make up air through the exhaust hood ensures the correct quantity of make up air
and good air distribution.