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SH5107: Industrial Ventilation

Assignment 4 – Specific Hood

Question 1

A laboratory fume hood, hood opening area A = 40 ft2 (3.72 m2), face velocity = 100 fpm (0.5 m/s), entry loss factor f = 0.5. Assume STP.

  1. Determine the volume flow rate required.
  2. Size the duct to give a duct velocity of nearest 2,000 fpm (10 m/s) and round off the diameter to a whole number in inches or cm.
  3. Determine the hood static pressure (SPh).

Question 2

  1. A canopy hood is being used on an open-surface tank, which is not located near any walls. The hood is located 1.2 m (4 feet) above the top of the tank. If the tank is 1.8 m (6 feet) long and 0.9 m (3 feet) wide and the contents are at room temperature, what airflow through the hood is required? Assume a control velocity of 0.75 m/s (150 ft/min).
  2. If a lateral slot hood is used to capture the vapor evaporated from the same open-surface tank with the same control velocity of 0.75 m3/s/m2 (150 ft3/min/ft2) of tank area. What airflow through the hood is required?

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