Drainage, Waste & VentQuestion 22 of 120
What is the maximum vertical distance permitted between a fixture outlet and the trap weir serving that fixture?
a.18 in
b.24 in
c.30 in
d.36 in
Explanation
The vertical drop from the fixture outlet to the trap weir may not exceed 24 in, which limits the velocity of falling waste that could otherwise scour the seal. 18 in is more restrictive than the code requires, and 30 in and 36 in exceed the permitted drop.
Practice all 120 questions free — no signup required.
Related questions on this topic
- Two lavatories are installed back to back on opposite sides of a wall and discharge into the same double fitting at the same level. What vent arrangement is being used?
- A kitchen sink is located in an island counter where no wall is available for a conventional vent. Which venting method is designed for this condition?
- An air admittance valve is used to vent an island sink. Which statement describes a correct installation?
- A commercial kitchen has a two-compartment sink whose drain must not connect directly to the sanitary drainage system. How must it discharge?
- A basement floor is below the elevation of the next upstream manhole on the public sewer. What device is required to protect the fixtures on that floor?
- A 3 in horizontal branch must gain 4-1/2 in of fall between two fixed points. At the minimum slope for 3 in pipe, what is the longest run that produces exactly that fall?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against Journeyman Plumber Licensing Exam (UPC/IPC-based) · How we review