Red Seal Plumber exam prep · Canada
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Readiness CoachQuestion 3 of 5
Drainage, waste and venting
What is the main function of a plumbing vent system connected to drainage piping?
ATo carry rainwater from the roof
Review BTo increase the temperature of wastewater
CTo balance air pressure and protect fixture trap seals
Correct DTo replace cleanouts in the drainage system
Read explanation
Vent piping allows air to move through the drainage system. This limits pressure changes that could siphon water out of a trap or force sewer gas through its water seal.
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Why this answer works
What is the main function of a plumbing vent system connected to drainage piping?
ATo carry rainwater from the roof
Review BTo increase the temperature of wastewater
CTo balance air pressure and protect fixture trap seals
Correct DTo replace cleanouts in the drainage system
ExplanationVent piping allows air to move through the drainage system. This limits pressure changes that could siphon water out of a trap or force sewer gas through its water seal.
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