Who determines the maximum length of dryer exhaust ducts exceeding 35 feet?

The maximum length of dryer exhaust ducts exceeding 35 feet is determined by both the dryer manufacturer's installation instructions and the power ventilator manufacturer's specifications. This is because the manufacturer's guidelines are designed to ensure safety and efficiency in the operation of the dryer. They take into account factors like air flow requirements, the type of dryer, and how duct length can impact performance.

When considering duct lengths that exceed certain limits, both sets of guidelines must be consulted to mitigate risks such as lint buildup, which can lead to fire hazards, and to ensure that the dryer operates effectively without excessive strain on its components. By following the recommendations from both manufacturers, installers can ensure that the exhaust system operates within safe and efficient parameters.

Options that refer only to local building codes or a single manufacturer's instructions may not provide a comprehensive solution, as standards can vary by location or may not fully address all potential issues related to duct length and performance. Therefore, the best practice is to consider the requirements from both manufacturers to ensure a safe and functional installation.