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Air Return Intakes - Sizes and Capacities

Size and capacity of air return intake

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Capacities of air return intakes:

Nominal Size
(in x in)

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Approximately Capacity
(cfm)

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10 x 4 100
10 x 5 125
10 x 6 155
10 x 8 215
12 x 4 120
12 x 5 155
12 x 6 190
12 x 8 260
12 x 10 325
14 x 4 145
14 x 5 180
14 x 6 220
14 x 8 305
24 x 4 260
24 x 5 320
24 x 6 390
24 x 8 490
24 x 10 665
24 x 12 795
30 x 4 300
30 x 5 400
30 x 6 485
30 x 8 660
30 x 10 830
30 x 12 1015
30 x 14 1160
30 x 16 1355

Screen Efficiency

The free intake area will be reduced by an insect or bird screen.

  • 1/2" mesh screen -> 90% free area
  • 1/4" mesh screen -> 80% free area
  • insect screen -> 50% free area
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Topics

Unit Converters

Temperature

oC
oF


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Length

m
km
in
ft
yards
miles
naut miles


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Area

m2
km2
in2
ft2
miles2
acres


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Volume

m3
liters
in3
ft3
us gal


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Weight

kgf
N
lbf


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Velocity

m/s
km/h
ft/min
ft/s
mph
knots


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Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O


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Flow

m3/s
m3/h
US gpm
cfm


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