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Air velocity in front of exhaust outlets
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The air velocity in a distance from an exhaust outlet can be expressed as
vc = vo π d2 / 48 x2 (1)
where
vc = air velocity in distance x from exhaust outlet (m/s)
vo = air velocity in the exhaust outlet opening (m/s)
d = diameter of exhaust outlet (m)
x = distance from exhaust outlet (m)
The equation above can be used for exhaust outlets with relatively small diameters.
Air velocity in distance 250 mm from a 250 mm duct with internal air velocity of 3 m/s can be calculated as
vc = 3 (m/s) π [0.250 (m)]2 / 48 [0.250 (m/s)]2
= 0.2 m/s
Note! The air velocity in distance one diameter from the duct outlet - is less than 10% of the duct air velocity.
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