What external condition can affect vent performance?

What external condition can affect vent performance?

• A. Indoor humidity level.
• B. Outdoor airflow restrictions, such as snow or debris blocking the exterior vent.
• C. Color of the exterior wall.
• D. Time of day.

Answer: (B)

External vent blockage directly restricts the path for exhaust air, which lowers vent performance. When snow or debris blocks the exterior vent, airflow is impaired, causing backpressure, longer drying times, more lint buildup inside the duct, and a higher risk of fire. Indoor humidity, wall color, or time of day don’t affect the airflow through the exterior vent, so they don’t impact vent performance.

External vent blockage directly restricts the path for exhaust air, which lowers vent performance. When snow or debris blocks the exterior vent, airflow is impaired, causing backpressure, longer drying times, more lint buildup inside the duct, and a higher risk of fire. Indoor humidity, wall color, or time of day don’t affect the airflow through the exterior vent, so they don’t impact vent performance.