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EXAM REVIEW
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Ihuman Case Study
LETRS
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Gas Fitter 2 Practice Test
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Question Number 20
A backflow prevent used in a hydronic heating system is used to:
A. Keep hot water from entering the cold water system
B. Hold the pressure on the system during a temporary shutdown to prevent the entry of air
C. Prevent the heating water from circulating the wrong way in the system
D. Keep non-combustible water from entering the drinking water system
✔ Correct Answer:
D. Keep non-combustible water from entering the drinking water system
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