non-return air damper|Backdraft (6",8",10",305mm)

Non-Return Air Damper (Backdraft Damper) – 6", 8", 10" & 305mm

Prevent backflow, odours, and cold draughts entering your home or building with Air Junction's Non-Return Air Dampers. Also known as backdraft dampers, these one-way valves allow air to flow freely in one direction while automatically closing to block reverse airflow when the fan or system is off.

Available in four sizes — 6" (150mm), 8" (200mm), 10" (250mm), and 305mm — to suit a wide range of residential and commercial ducted ventilation applications.

Key Features

• Prevents backdraft — automatically closes when airflow stops, blocking cold air, odours, and insects from entering
• One-way airflow — opens freely under positive pressure, closes under negative or zero pressure
• Four size options — 6", 8", 10", and 305mm to suit standard round duct diameters
• Lightweight construction — low resistance to airflow for efficient ventilation performance
• Easy installation — inline fitting for standard flexible and rigid round ductwork
• Australian stock — fast dispatch from our Sydney warehouse

Available Sizes

• 6" (150mm) — suits bathroom exhaust fans and small ventilation outlets
• 8" (200mm) — common size for kitchen range hoods and laundry exhaust
• 10" (250mm) — suits larger exhaust fans and inline fan installations
• 305mm — ideal for commercial ventilation and larger duct runs

Typical Applications

• Bathroom and laundry exhaust fan systems
• Kitchen range hood ducting
• Inline fan and ducted ventilation installations
• Commercial and residential HVAC exhaust systems
• Preventing pest and cold air ingress through duct openings

Select the size that matches your duct diameter. Not sure which size you need? Contact us and we’ll help you choose the right damper for your system.