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Im designing a walk in cooler and freezer and I have the condensate from each drained to a near by mop sink. Do I need to vent these lines?

Thanks for all the responses so far. Do anyone have comments on which is better, a condensate pump or gravity drain. And if the gravity drain is better, what is the best way to set one up?

I recently design an AHU above ceiling unit with a condensate pump located in the emergency drip/overflow pan. The contracter left me a comment stating that whenever possible the condenstation from the HVAC equipment should be a gravity flow drain and not rely on mechanical means for discharge...