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Duct Sizer

FORMULA

Area = CFM / Velocity

400 / 900 = 0.44 ft²

64.0 in² • 413 cm²

EQUIVALENT DIA

9.0"/ 229 mm

Round duct equivalent

DUCT AREA

64 in2

0.444 ft2 • 0.041 m2

STATUS

Low velocity • هادئ

suitable for quiet spaces

Friction → • Noise low

Suggested Rectangular Sizes

1

8" x 8" / 203 mm x 203 mm

64 in2- Ratio 1:1 • Closest to square

2

6" x 10" / 152 mm x 254 mm

60 in2- Ratio 1.67:1 • Aspect OK