PVC Round Backdraft Damper Check Valve – Kitchen & Bathroom

Round PVC Backdraft Damper & Air Duct Check Valve

Keep your kitchen and bathroom air clean and odor-free with this durable Round PVC Backdraft Damper Check Valve. Designed for range hood exhaust systems, bathroom ventilation fans, and air duct setups, this one-way check valve prevents unwanted backflow of air, odors, and gases — ensuring fresh, controlled airflow through your ventilation system at all times.

Whether you're upgrading your range hood, bathroom exhaust fan, or public flue system, this electricity-free, pneumatically operated valve opens when air flows through and seals shut automatically when airflow stops. Simple, reliable, and maintenance-free.

Key Features

• Material: High-quality PVC plastic — lightweight, durable, and corrosion-resistant
• One-Way Valve Design: Prevents backflow of odors, smoke, and gases into living spaces
• Electricity-Free Operation: Pneumatically powered — no wiring or batteries needed
• Double-Ended Anti-Odor Check: Extra defense against odor and smoke intrusion
• Normally Open Structure: Opens with airflow, seals automatically when fan is off
• Standard Temperature Compatible: Suitable for normal operating temperatures
• Versatile Use: Ideal for range hoods, bathroom ventilation fans, kitchen flues, wall duct fans, and public flue systems

Two Installation Methods

• Style A: Double-ended connection for PVC pipe with outer diameter of 110mm
• Style B: Double-ended connection for aluminum foil tube with inner diameter of 80/100mm

Specifications

Package Contents

• 1x Flue Smoke Control Check Valve (No Other Accessories Included)

Note: Colors may vary slightly between monitors. Manual measurements may have a 1–3 cm tolerance — please account for this when ordering.

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Frequently Asked Questions

Q: What is a backdraft damper check valve and how does it work?

A: A backdraft damper check valve is a one-way airflow control device installed in ventilation ducts. It allows air to flow in one direction (outward, through your exhaust fan) and automatically closes when the fan is off, preventing outside air, odors, or gases from flowing back into your home. This PVC round check valve operates pneumatically — no electricity required.

Q: What pipe sizes is this check valve compatible with?

A: This check valve offers two installation styles: Style A connects to PVC pipes with an outer diameter of 110mm, while Style B connects to aluminum foil tubes with an inner diameter of 80mm or 100mm. Please measure your existing ductwork before purchasing to ensure compatibility.

Q: Where can this PVC backdraft damper be installed?

A: This versatile check valve is suitable for a wide range of ventilation applications including kitchen range hood exhaust systems, bathroom ventilation fans, toilet wall duct fans, and public or shared flue systems. It's designed to work at normal ambient temperatures and is ideal for residential and light commercial use.

Q: Does this check valve require any electrical connection?

A: No — this check valve is completely electricity-free. It operates using the pneumatic force of airflow from your exhaust fan, opening automatically when the fan runs and closing when it stops. No wiring, batteries, or smart controls are needed.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.