What is the role of an exterior vent cap and what features should it have?

• A. It blocks exhaust from leaving.
• B. It is optional and has no features.
• C. It provides weather protection and exhaust release; include a backdraft damper and insect screen.
• D. It only serves as a decorative cover.

Answer: (C)

The exterior vent cap sits on the outside wall and serves as the exit point for the dryer exhaust while guarding the opening from weather and pests. It should let exhaust escape freely but protect the duct from rain, snow, and wind-driven intrusion.

A backdraft damper is important because it prevents outside air from blowing back into the duct when the dryer is off, which helps keep moisture and lint from entering the living space. An insect screen keeps pests, birds, and debris from entering the vent and can reduce lint buildup inside the vent.

Overall, the cap should be weatherproof, properly sized for the duct, made of corrosion-resistant materials, and designed to be easily opened for cleaning and inspection.