For a 2 inch pipe, the maximum distance from fixture trap to vent is?

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Prepare for the Illinois State Plumbing Test. Use flashcards and multiple-choice questions with hints and explanations to enhance your knowledge. Ensure your success on exam day!

Multiple Choice

For a 2 inch pipe, the maximum distance from fixture trap to vent is?

Explanation:
Venting must be close enough to the trap to prevent siphon when the fixture drains. The distance from the trap to the vent, called the trap arm, is limited by pipe size. For a 2-inch pipe, the maximum trap-to-vent distance is four feet. This keeps the vent within reach to relieve negative pressure and keep the trap from siphoning. The other distances either are shorter than the maximum or exceed what a 2-inch trap arm is allowed, so they’re not correct for this size.

Venting must be close enough to the trap to prevent siphon when the fixture drains. The distance from the trap to the vent, called the trap arm, is limited by pipe size. For a 2-inch pipe, the maximum trap-to-vent distance is four feet. This keeps the vent within reach to relieve negative pressure and keep the trap from siphoning. The other distances either are shorter than the maximum or exceed what a 2-inch trap arm is allowed, so they’re not correct for this size.

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