Under what conditions are ducts for heating, ventilation, and air-conditioning (HVAC) systems required to be equipped with fire and smoke dampers?
A. When a duct penetrates a fire wall, regardless of the fire-resistance rating
B. When the duct penetrates a fire wall with a 2 hour or greater fire-resistance rating
C. If building is greater than three stories and not fire-resistive or noncombustible construction
D. In healthcare or public assembly occupancies with a rating occupancy load of over 20 persons
Answer: B. When the duct penetrates a fire wall with a 2 hour or greater fire-resistance rating
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Which of the following does not describe the thymus?
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