The Broan‑NuTone 641 Aluminum Wall Cap is a durable, easy‑to‑install exterior vent cap designed for reliable performance in a wide range of ventilation applications. Constructed from long‑lasting aluminum, this wall cap is built to withstand outdoor conditions while maintaining efficient airflow through a 6‑inch round duct connection.

Its spring‑loaded backdraft damper reduces wind‑induced noise and prevents unwanted outdoor air from entering the home, while the integrated bird screen helps keep small animals and debris out of the ductwork. With a clean natural aluminum finish and a compact square profile, this wall cap provides both effective ventilation and a professional exterior appearance. It is suitable for use with exhaust fans, range hoods, and general-purpose home ventilation—but not recommended for dryer venting.

Key Features

• Designed for 6‑inch round ducting
• Durable aluminum construction for long‑lasting outdoor use
• Spring‑loaded backdraft damper minimizes wind chatter and prevents air intrusion
• Built‑in bird screen protects against pests and debris
• 9‑inch square exterior profile for clean, functional installation
• Suitable for ventilation of exhaust fans, range hoods, and similar applications
• Not recommended for dryer venting

Common Applications

• Bathroom exhaust fans
• Range hoods
• Recreational rooms
• Utility rooms
• General home ventilation systems