Does the Ontario plumbing code allow a U loop in a vent line for a basement bathroom to get around a heating duct?

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No plumbing code allows a loop in a vent line. They must be pitched just like a drain line as there are many conditions where water can be in a vent line, such as rain through a roof vent and condensation. If the "u" were to fill with water it would no longer function as a vent.
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