Quiz: 2024 International Residential Code (IRC) Chapter 15 Exhaust Systems

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1. Where shall air removed by a mechanical exhaust system be discharged?

Into an attic space if properly vented.
Into a ventilated soffit.
To the outdoors in accordance with Section M1504.3.
Into a crawl space with adequate cross-ventilation.

2. Which of the following is an allowed exception for discharging exhaust air into an attic space?

Exhaust from a clothes dryer with a booster fan.
Air from a domestic cooking exhaust system.
Whole-house ventilation-type attic fans that discharge into the attic space of dwelling units having private attics.
Bathroom exhaust fans operating intermittently.

3. How shall clothes dryers be exhausted?

Into a common exhaust system for all appliances.
In accordance with the manufacturer's instructions.
Directly into the dwelling unit's attic space.
Through a 3-inch diameter duct regardless of manufacturer specification.

4. Clothes dryer exhaust systems must be independent of all other systems and convey moisture outdoors. What is the exception to this rule?

Dryer exhaust systems utilizing a shared exhaust duct with a bathroom fan.
Listed and labeled condensing (ductless) clothes dryers.
Dryer exhaust systems that discharge into a ventilated attic.
Systems where the total duct length is less than 10 feet.

5. If a dryer manufacturer's instructions do not specify a termination location, where must the exhaust duct terminate relative to openings into buildings?

Not less than 1 foot in any direction.
Not less than 3 feet in any direction.
Not less than 5 feet vertically above.
Not less than 6 inches from the nearest wall.

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