Construction
Condensate Line Sizing Calculator
AC pulls 2-3 gallons of water per day per ton. Right-size the drain to prevent overflow and water damage.
Drain size
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- Gallons/day
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- Min slope
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- Float switch?
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FAQ
Why a trap? +
Without a trap, the negative pressure inside the air handler can suck air up through the drain, blocking water flow.
Float safety switch? +
IRC requires one on units with secondary drain pans. Cheap insurance against ceiling water damage.