80–200mm Ventilation Pipe Check Valve | Exhaust Fan Backdraft Stop

80–200mm Round Ventilation Pipe Check Valve – Backdraft Stopper for Exhaust Fan Ducts

Keep your home's airflow moving in the right direction with this durable round ventilation pipe check valve. Engineered from high-quality ABS plastic, this shutoff valve fits standard duct diameters from 80mm to 200mm, making it a versatile solution for kitchen range hoods, bathroom exhaust fans, HVAC systems, and general ventilation pipe projects. Its clever one-way airflow design lets air flow freely outward while blocking backdraft and preventing odours from creeping back into your space.

Made in Mainland China.

Key Features

• Premium ABS Construction: Durable, lightweight plastic body with a non-oxidising finish ensures long-lasting, corrosion-resistant performance.
• 5 Size Options: Available in 80mm (3.14"), 100mm (3.93"), 110mm (4.33"), 150mm (5.90"), and 200mm (7.87") to suit a wide range of pipe diameters.
• Backdraft Prevention: One-way shutoff mechanism allows smooth outward airflow while automatically closing to block reverse airflow, odours, and drafts.
• Tool-Free Installation: Simply slide or connect the valve to your existing ventilation pipe — no specialist tools or skills required.
• Wide Application: Ideal for exhaust fan pipes, kitchen hoods, bathroom ventilation, HVAC ducting, air ducts, and general pipe ventilation projects.
• Clean White Finish: Neutral white colour blends seamlessly with most duct systems and interior spaces.

Specifications

Package Contents

• 1 × Ventilation Pipe Check Valve (size of your choice)

Note: Actual colour may vary slightly from images due to monitor brightness settings. Please allow minor measurement tolerances of ±1–2mm.

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For guidance on indoor ventilation standards and best practices, visit the U.S. EPA Indoor Air Quality resource page.

Frequently Asked Questions

Q: What sizes does this ventilation pipe check valve come in?

A: This round check valve is available in five sizes: 80mm (3.14"), 100mm (3.93"), 110mm (4.33"), 150mm (5.90"), and 200mm (7.87"). Select the size that matches your existing exhaust fan or ventilation duct diameter for a secure, leak-free fit.

Q: How does the check valve prevent backdraft and odours?

A: The valve features a one-way shutoff mechanism — a flap or damper that opens freely when your exhaust fan is running (pushing air outward) and automatically closes when the fan is off, blocking reverse airflow, outside drafts, insects, and odours from re-entering your space through the duct.

Q: Is this check valve compatible with standard PVC or ABS ventilation pipes?

A: Yes. Made from ABS plastic with standard round dimensions, this check valve is designed to connect easily with most common round ventilation pipes, exhaust fan ducts, and HVAC duct fittings of the corresponding diameter. No adhesive or specialist tools are required for installation.

Q: Can this valve be used in both kitchen and bathroom ventilation systems?

A: Absolutely. This versatile check valve is well-suited for kitchen range hoods, bathroom exhaust fans, laundry room vents, and any other general ventilation ducting application that requires one-way airflow control.