Core TradesQuestion 42 of 700
Condensate from a high-efficiency (condensing) gas furnace is mildly acidic, so before or as it is discharged to an approved drain it should be:
a.Piped into the combustion-air intake
b.Discharged onto the roof surface
c.Returned to the gas supply line
d.Neutralized or routed to an approved corrosion-resistant drain
Explanation
Condensing-furnace condensate is acidic and can corrode metal drains, so it is neutralized and/or sent to an approved corrosion-resistant drain. Routing it to the air intake, roof, or gas line is unsafe and improper.
Law Reference: 2025 CA Mechanical Code (CMC) §310 (Condensate)Practice all 700 questions free — no signup required.
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