USCG Exam PracticeAir conditioning, ventilation, and compressed air
A compartment above the weather deck contains gas-consuming appliances and is fitted with natural ventilation. Under 46 CFR §58.16-20, which arrangement satisfies the minimum regulatory requirement?
- A. One natural ventilator duct extending to the overhead, with the motor located inside the compartment
- ✓ Two natural ventilator ducts, one extending to the floor level and one to the overhead, with any powered ventilation motor located outside the compartmentCorrect
- C. Powered ventilation only, with capacity to change the air once every 6 minutes
- D. Two natural ventilator ducts, both extending to the overhead of the compartment
Why B is correct
46 CFR §58.16-20(a) requires at least two natural ventilator ducts — one extending to the floor level and one to the overhead — for above-deck compartments. If powered ventilation is used, the motor must be outside the compartment. A single duct, two ducts both at the overhead, or powered ventilation alone do not meet the stated requirements.
Cited:46 CFR §58.16-20