How should the emergency exhaust for a chiller machine room be arranged?
Correct Answer
C) Taking suction near the floor and discharging outside the building
Emergency ventilation has to remove refrigerant vapor from where it actually collects and take it out of the building entirely. Since the vapor is heavier than air and settles low, the exhaust inlet belongs near the floor. The discharge goes outdoors, away from air intakes and occupied areas, never back into the building. A system that recirculates or that pulls only from the ceiling leaves the dangerous layer sitting exactly where a worker would breathe it.
Why This Is the Correct Answer
Taking suction low captures the heaviest concentration of vapor, and discharging outdoors removes it from the building rather than relocating the hazard. This arrangement is what actually clears a machine room after a release and makes it safe to re-enter after monitoring confirms the space is clean.
Why the Other Options Are Wrong
Option A: Drawing air from the ceiling and returning it to the building air handler
Ceiling level suction misses the dense vapor layer near the floor, and returning the air to the building spreads the hazard into occupied spaces.
Option B: Recirculating room air through a carbon filter and back into the space
Carbon filters are not a control for refrigerant vapor, and recirculating the air keeps the refrigerant inside the building. The vapor would keep circulating through the space that the workers are trying to clear.
Option D: Blowing outside air across the chiller with a portable fan on the floor
A portable fan stirs the room without removing anything and can push vapor toward doorways and workers instead of exhausting it.
Memory Technique
Low in, outside out. Never send it back into the building.
Reference Hint
Emergency machine room ventilation takes suction near the floor, where heavy refrigerant vapor collects, and discharges outdoors.
More epa-608-type-3 Questions
Some jobs on a chiller count as a major repair under the refrigerant rules, which changes what a technician is allowed to do with a badly leaking machine. Which job falls into that category?
An owner asks how many pounds of refrigerant the rules allow to be left inside a chiller once the recovery has been signed off. What is the correct answer to give him?
The motor of a hermetic centrifugal chiller sits inside the pressure boundary rather than outside it on a shaft. What follows from that construction?
An oxygen monitor is used to decide whether a chiller machine room is safe to enter after a refrigerant release. Below what oxygen reading is the atmosphere treated as oxygen deficient?
A low-pressure chiller's rupture disc has a discharge line running from it. Where does that line have to terminate?
A refrigerant vapor detector in a chiller machine room reaches its alarm level. Besides sounding, what is that alarm expected to do?
Which piece of equipment requires a technician to hold Type III certification before it may be serviced?
What property of the refrigerant is what actually places an appliance into the low-pressure category?
During normal operation, what condition exists inside the evaporator of a running low-pressure centrifugal chiller?
In what unit is the required final recovery vacuum for a low-pressure appliance normally expressed?
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The motor of a hermetic centrifugal chiller sits inside the pressure boundary rather than outside it on a shaft. What follows from that construction?
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