What is the maximum width for a dryer exhaust duct to qualify under standard specifications?

The standard specifications for dryer exhaust ducts stipulate that to ensure efficient operation and prevent lint buildup, the maximum width (or diameter) allowable for a dryer exhaust duct is 4 inches. This limitation is in place to maintain optimal airflow and to minimize the chances of obstruction. A narrower duct reduces the potential for lint accumulation, which could lead to fire hazards or inefficient dryer operation.

Larger diameter ducts, such as 5 inches, 6 inches, or 8 inches, are not compliant with the standard specifications primarily because they may compromise the dryer’s performance and safety by allowing a decrease in the airflow velocity, thereby not effectively exhausting lint and other particles. Therefore, the choice of 4 inches aligns with the regulatory guidelines to promote maximum efficiency and safety in dryer venting.