Core TradesQuestion 149 of 700
Without a booster fan, the MAXIMUM developed length of a residential clothes-dryer exhaust duct (before deductions for fittings) is generally:
a.14 feet
b.50 feet
c.35 feet
d.25 feet
Explanation
The standard maximum developed length is 35 feet, from which a set length is deducted for each elbow, unless the manufacturer's instructions or the fitting-equivalent table allow otherwise. 14 and 25 feet are shorter than the code baseline, and 50 feet exceeds it without a booster fan.
Law Reference: 2025 CA Mechanical Code §504.0Practice all 700 questions free — no signup required.
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