Cơ sở, Vệ sinh & Côn trùngCâu 285 / 320
Which backflow prevention method is considered the most reliable because it creates a physical gap that no back-siphonage can cross?
a.An air gap between the faucet outlet and the flood rim of the sink
b.A garden hose left in a bucket
c.A closed valve on the supply line
d.A rubber gasket on the faucet
Giải thích
An air gap, an unobstructed vertical space between a water outlet and the flood rim of the receiving fixture, is the most reliable backflow prevention because there is no physical connection for contaminated water to travel back through. The gap should generally be at least twice the diameter of the supply opening and never less than one inch. Mechanical devices help but can fail; an air gap cannot be back-siphoned.
Trích dẫn luật: FDA Food Code §5-202.13Luyện miễn phí toàn bộ 320 câu hỏi — không cần đăng ký.
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