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What is the diameter of a round duct if the flow rate is 1000 CFM and the velocity pressure is 2.25 inches of water gauge?

What is the diameter of a round duct if the flow rate is 1000 CFM and the velocity pressure is 2.25 inches of water gauge?

Compute velocity pressure using the formula:

V= 4005 x VP, where

V= velocity, feet per minute (fpm)

VP = velocity pressure, inch in water gauge

Compute cross sectional area of a circular duct using formula:

AREA = r2; where:r = the radius of the duct; 2r = d; d = diameter

Compute volumetric Flow Rate using the formula:

Q = VA, where

Q = flow rate (ft3/ min or M3/min)

V = Velocity (ft/min or m/min)

A = cross sectional area (ft2 or m2)

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