Which statement is false concerning clothes dryer exhaust?

Which statement is false concerning clothes dryer exhaust?

• A. Clothes dryers shall be provided with makeup air when exhausting more than 150 cfm.
• B. Screens shall not be installed at a clothes dryer duct termination.
• C. Clothes dryers shall be exhausted in accordance with the manufacturer's instructions.
• D. Clothes dryer exhaust ducts shall not extend into or through ducts or plenums.

Answer: (A)

Clothes dryer exhaust is meant to vent to the outdoors in accordance with the manufacturer's instructions, using a dedicated, smooth metal duct and a properly sized termination that does not feed back into the building. A statement that makeup air must be provided when the dryer exhaust exceeds a certain rate (like 150 cfm) is not a standard requirement for typical dryer installations. Make-up air requirements generally apply to other high-velocity or commercial exhausts, but not as a specific rule for residential clothes dryer exhaust. So that claim is false. Following the manufacturer's instructions for exhaust ensures the dryer operates safely and efficiently, including vent diameter, maximum length, and number of bends. Exchanging air through the building fabric to a separate space is not the intended function of the dryer exhaust system, and it must not be routed into other ducts or plenums. Screens at the termination are discouraged because they can trap lint, impede airflow, and pose a fire hazard; the exhaust should terminate at an appropriate outdoor hood designed for dryer vents.

Clothes dryer exhaust is meant to vent to the outdoors in accordance with the manufacturer's instructions, using a dedicated, smooth metal duct and a properly sized termination that does not feed back into the building. A statement that makeup air must be provided when the dryer exhaust exceeds a certain rate (like 150 cfm) is not a standard requirement for typical dryer installations. Make-up air requirements generally apply to other high-velocity or commercial exhausts, but not as a specific rule for residential clothes dryer exhaust. So that claim is false.

Following the manufacturer's instructions for exhaust ensures the dryer operates safely and efficiently, including vent diameter, maximum length, and number of bends. Exchanging air through the building fabric to a separate space is not the intended function of the dryer exhaust system, and it must not be routed into other ducts or plenums. Screens at the termination are discouraged because they can trap lint, impede airflow, and pose a fire hazard; the exhaust should terminate at an appropriate outdoor hood designed for dryer vents.