Systems & Code第 109 / 110 题
An air gap at a lavatory faucet must be maintained above the flood-level rim. If the effective opening of the faucet is 1/2 in and the outlet is near a single wall, the required gap is three times the opening. What is the minimum air gap?
a.1-1/2 in
b.1 in
c.2 in
d.3 in
解析
Near a single wall the multiplier is three times the effective opening, so 3 x 1/2 in = 1-1/2 in. Away from walls the standard multiplier is two times the opening, but a nearby wall disrupts the free fall of air and requires the larger gap. The air gap is the most reliable backflow protection because it is a fixed physical break.
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