A grease-exhaust duct carries 3,000 cfm through a 3 ft² cross section. Assuming uniform velocity, what is the average duct velocity?
- A100 ft/min
- 1,000 ft/min
- C9,000 ft/min
- D3 ft/min
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why B is correct
Velocity = 3,000 / 3 = 1,000 ft/min. Duct velocity is not hood capture velocity; this calculation does not establish code-compliant exhaust design.