Plumber Red Seal · Question
A vent stack is required to be connected to the base of a drainage stack with a yoke vent when the drainage stack serves storeys located above:
The NPC mandates yoke vents at intervals of not more than 10 storeys to relieve positive pressure that can build up at the base of a tall drainage stack, preven
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Question: A vent stack is required to be connected to the base of a drainage stack with a yoke vent when the drainage stack serves storeys located above:
Answer options:
- 3 storeys
- 5 storeys ✅ 10 storeys
- 12 storeys
Correct answer: 10 storeys
Explanation: The NPC mandates yoke vents at intervals of not more than 10 storeys to relieve positive pressure that can build up at the base of a tall drainage stack, preventing trap seal blow-out.
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