QWORK Draft Blocker 6-Inch Damper Stopper - 2-Pack Backflow Damper for Ducts

Overview

The QWORK Draft Blocker is a compact 6-inch damper stopper designed to integrate into HVAC ducts, from air conditioners and dryers to exhausts and heating lines. Its valve opens and closes automatically as airflow changes, helping to maintain one-way flow where needed. A smooth-running spring pairs with an internal foam strip to minimize rattling, delivering quieter, more predictable operation. The unit can be mounted horizontally or vertically, making retrofits and reconfigurations straightforward.

Ideal for both flexible and non-flexible ventilation runs, this backdraft damper is built to sit fully inside the duct with a flip-up cover that supports retrofit installs. The package includes two dampers, providing a ready-to-use solution for multiple connections in a single project.

Key Benefits

• Automatic valve response at low airflow helps regulate backdrafts without manual adjustment.
• Internally cushioned by a foam strip to reduce rattling and promote smooth, quiet operation.
• Versatile mounting options allow horizontal or vertical installation to fit existing layouts.
• Retrofit-ready design with a fold-down cover that sits inside the duct for a clean, unobtrusive look.
• Durable, two-pack configuration offers value and coverage for multiple connections.

Applications & Compatibility

• Suitable for air conditioners (AC), dryers, exhaust units, hoods or range hoods, and heating ducts.
• Fits both flexible and non-flexible ventilation ducts.
• Note: Not compatible with certain plastic ducting due to sizing differences.

Installation Tips

Install by inserting the damper into the vent pipe until it stops. For horizontal installations, position the spring horizontally to optimize opening and closing. Ensure the return louvers are oriented with the damper blades opening toward the outlet direction only.

What You Get

2 × 6-inch backdraft dampers, ready to install in a variety of HVAC ducting scenarios.