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2024 International Residential Code (IRC)
Chapter 16 Duct Systems

Quiz: 2024 International Residential Code (IRC) Chapter 16 Duct Systems

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1. Which of the following standards applies to factory-made ducts for above-ground duct systems?

ASTM E84
UL 181
SMACNA HVAC Duct Construction Standards
ASTM C411

2. What is the maximum allowable discharge air temperature for equipment connected to above-ground duct systems?

150°F (66°C)
200°F (93°C)
250°F (121°C)
300°F (149°C)

3. Which standard governs fibrous glass duct construction for above-ground systems?

ASTM A653
UL 181
SMACNA Fibrous Glass Duct Construction Standards
ASTM E2231

4. When are gypsum products permitted for the construction of return air ducts or plenums?

Always permitted for return air ducts.
Only if the air temperature exceeds 150°F (66°C).
Provided air temperature does not exceed 125°F (52°C) and surfaces are not subject to condensation.
Never permitted for duct construction.

5. What is the maximum flame spread index allowed for duct systems constructed of materials for above-ground applications?

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