Fixtures & Water HeatersQuestion 76 of 120
A 3/8 inch indirect waste tube from a beverage dispenser discharges over an open receptor. Applying the air gap rule, what is the required air gap?
a.3/4 inch
b.1 inch
c.1-1/2 inches
d.3/8 inch
Explanation
Twice the pipe diameter would be only 3/4 inch, but the code also sets an absolute floor of 1 inch, so the required air gap is 1 inch. The 3/4 inch answer applies the multiplier and ignores the minimum. 1-1/2 inches and 3/8 inch are not produced by either part of the rule.
Law Reference: IPC §802.2Practice all 120 questions free — no signup required.
Related questions on this topic
- Where an enclosure takes combustion air from an adjacent room through two permanent openings, where must those openings be located?
- A shower compartment is framed 32 inches by 32 inches inside the finished walls. Does it meet the minimum area and minimum dimension requirements for a shower?
- An indirect waste pipe from a commercial ice machine is 1-1/2 inches in diameter and discharges into a floor sink. What is the minimum required air gap?
- A laundry standpipe for a residential clothes washer is roughed in with the top of the standpipe 14 inches above the trap weir. Is the installation acceptable?
- A showerhead is rated at the maximum allowable flow. A user showers for 8 minutes. Assuming the head flows at its rated maximum, how much water is used?
- A public restroom is fitted with metering faucets. What is the maximum volume of water each faucet may deliver per metering cycle?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Journeyman Plumber Licensing Exam (UPC/IPC-based) · How we review