What standard must domestic dryer exhaust duct power ventilators meet?

Domestic dryer exhaust duct power ventilators must meet the standards set by UL 705. This standard pertains specifically to the safety and performance requirements for ducted ventilation equipment associated with clothes dryers. Adhering to UL 705 ensures that the power ventilators used can effectively handle the conditions involving moist air, lint, and heat, which are critical for safe and efficient dryer operations.

The other standards mentioned do not relate to this specific application. For example, UL 200 pertains to certain types of commercial equipment, UL 105 focuses on gas appliances, and UL 50 concerns enclosures for electrical equipment, none of which would cover the safety and performance requirements necessary for dryer exhaust duct power ventilators. Therefore, selecting UL 705 as the standard ensures compliance with the regulations that directly address the requirements of domestic dryer exhaust systems.