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Ventilation Systems - Return Intakes

Size and capacities of air return intakes.

 

air return intake

Capacities of air return intakes:

air return intake

Ventilation Systems - Return Intake Capacities
Nominal Size
(in x in)
Approximately Capacity
(cfm)
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

Related Topics

  • Ventilation Systems

    Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

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