InstallationQuestion 26 of 110
A high-efficiency condensing furnace (Category IV) is typically vented with what material?
a.Type B double-wall metal vent
b.Single-wall galvanized pipe
c.Listed PVC or CPVC plastic pipe
d.Masonry chimney only
Explanation
Condensing furnaces cool flue gases below their dew point, producing acidic condensate and low-temperature exhaust, so they are vented with listed plastic pipe such as PVC or CPVC. Metal Type B vent would corrode and is not rated for positive-pressure condensing appliances. Manufacturer instructions specify approved materials and lengths.
Law Reference: 2022 California Mechanical Code (CMC)Practice all 110 questions free — no signup required.
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