AC Infinity 4-Inch Backdraft Damper — One-Way Airflow Ducting Insert

Introducing the AC Infinity 4-Inch Backdraft Damper, a purpose-built ducting insert for range hoods, bathroom fans, and other compact HVAC paths. Its goal is to minimize unintended air movement while preserving efficient venting, so you experience steadier rooms with less draft and more even airflow.

Smart design for real-world use

• An antidraft duct insert designed for use with range hoods, bathroom fans and other home HVAC applications.
• Outer rubber gaskets create an airtight seal and grip between the damper and ducts.
• Mounts horizontally or vertically to prevent backflow and debris from entering ducting.
• Galvanized steel body with spring-loaded aluminum damper blades that open with minimal airflow.
• Fits 4 in. duct openings; product length: 5.03 inches; finished in a durable powder coat.

Practical benefits in daily spaces

• May reduce drafts around cooking exhausts, keeping kitchen air more comfortable while venting quietly.
• Helps prevent dust, insects, and debris from entering ductwork in bathrooms and laundry rooms.
• Durable materials resist humidity and daily use, supporting long-term performance in humid environments.
• Compact dimensions suit standard 4-inch ducts without adding bulk to ceiling or wall installations.

Installation is straightforward: position the damper in a 4-inch duct, secure the outer gasket for a tight seal, and confirm the blades respond smoothly as air flows. The powder-coated finish adds a layer of protection against moisture and corrosion, helping maintain appearance and function over time.

Why choose AC Infinity

Designed to work with common ventilation paths, this damper provides a practical solution for improving airflow control in busy kitchens and bathrooms. It’s a thoughtful upgrade that aligns with everyday needs for comfort, cleanliness, and reliable ventilation.