HVAC Journeyman Practice Exam

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When installing clothes dryer exhaust ducts, what is one requirement for the duct length?

Must not exceed 10 feet
Must not include any elbows
Must comply with the manufacturers' installation instructions
Must be insulated

The correct answer is: Must comply with the manufacturers' installation instructions

The requirement regarding the duct length for clothes dryer exhaust ducts emphasizes the importance of adhering to the manufacturers' installation instructions. Each manufacturer designs their dryers with specific outlet and duct specifications to ensure optimal performance and safety. These instructions account for the size, material, and configuration of the ducting, which can affect the dryer’s efficiency and the risk of fire hazards. Therefore, following the manufacturer’s guidelines about duct length not only ensures compliance with safety standards but also helps in maintaining the effectiveness of the drying process. While various standards and codes may suggest optimal lengths and configurations for dryer ducts, the primary authority comes from the manufacturer. This means that the specific requirements laid out in the installation manual should take precedence over general guidelines. This approach also recognizes the variations in design and technology among different models and brands.