Sizing a blower.

[Burnerguy]

I am working on a oven design for a customer and need help sizing a blower.
The purpose of this blower will be to recirculate the air within this 768 cubic foot oven 16 times per hour. I did the basic math of multipling the cubic feet by the times per hour divided by 60 minutes to come up with 204.8acfm but, this is only the CFM at the face of the blower. I need to know(I believe) the "Feet Per Minute velocity" and how to calculate that.

Can anyone help?

 

[rbulsara]

Post your question in mechanical (HVAC) forum.

 

[skiier]

Volume=Area*Length or (V=A*l)

Hence
dV/dt= A * dl/dt

since
dl/dt= velocity = v

then
dl/dt = v = dV/dt *1/A

or
v = 204ft3/min * 1/A


For a square duct A= l x w

For a round duct A=pi*r2

just guessing though