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2024 International Residential Code
Chapter 15

IRC 2024

2024 International Residential Code

Chapter 15Exhaust Systems

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Question 1 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.

Question 2 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.

Question 3 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.

Question 4 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.

Question 5 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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