For a 45-degree elbow in an electric dryer duct, how many feet does it count according to IRC?

In the context of the International Residential Code (IRC), the way that bends or elbows in duct systems are measured is critical for determining proper airflow and duct sizing. A 45-degree elbow in a duct typically adds additional length to the effective duct run.

According to IRC guidelines, a 45-degree elbow is generally counted as 2.5 feet of straight duct. This standard is applied to ensure that the resistance to airflow is appropriately accounted for in duct planning and installation. This accounting for bends is particularly important in systems such as those found in electric dryers, where proper venting is necessary to prevent lint buildup and ensure efficient functioning.

In summary, when assessing the impact of a 45-degree elbow in ductwork, the IRC specifies counting it as 2.5 feet. This measurement helps ensure that the total duct length accommodates airflow needs.