According to IRC, how much length does each 90-degree elbow count as for electric dryer duct?

The correct answer is based on the guidelines established by the International Residential Code (IRC) regarding the installation of electric dryer ducts. Each 90-degree elbow in a duct system is significant because it adds to the total effective length of the duct.

The IRC specifies that for every 90-degree bend in ductwork, you must consider an additional length of 5 feet. This standard helps ensure that duct systems maintain a proper airflow and efficiency. When planning the installation of dryer ducts, understanding this adjustment is crucial as it impacts the overall duct length calculations, ventilation effectiveness, and appliance performance.

This specific measurement is important to adhere to for safety and functionality, ensuring that the dryer operates efficiently and reduces the risk of lint buildup, which can lead to fire hazards.