4-Inch 240 CFM Automatic Dryer Booster Fan – Auto On/Off Sensor, Post-Purge

Are your clothes taking multiple cycles to dry? If your home has a dryer duct that runs longer than 20 feet or features multiple bends, weak exhaust airflow is likely trapping lint and moisture in your lines. The Rysmirs 4-Inch Dryer Booster Fan is specifically engineered to eliminate sluggish drying, pushing airflow up to 100 feet to maximize your dryer’s efficiency, save energy, and keep your venting system safe.

Key Features & Benefits

• Auto-Sync & Post-Purge Technology: Automatically turns on and off by detecting your dryer\'s airflow. The smart post-purge setting continues running for 3–5 minutes after the drying cycle ends to fully clear residual lint and moisture, keeping ducts completely clean for the next load.

• Powerful 240 CFM Airflow: Delivers robust performance designed specifically for long or complex venting systems. It effortlessly navigates multiple bends and excessive duct lengths, keeping your dryer operating at peak performance.

• Drastically Reduce Drying Time: Weak exhaust airflow wastes electricity and time. This booster fan forces hot, moist air out immediately, allowing your clothes to dry in a single cycle even with duct runs up to 100 feet.

• Adjustable Pressure Sensor Switch: Features a customizable air pressure threshold, making it compatible with almost all brands of dryers on the market. Skip the hassle of matching systems—this fan adapts to your specific setup.

• Safe, Durable & Universal: Fits standard 4-inch round dryer ducts and works seamlessly with most electric clothes dryers (120V). Built for a 10+ year service life, it includes thermal overload protection, a fire-resistant thermoplastic housing, and corrosion-resistant components.

Technical NumberRF-110W1-DAirflow Capacity240 CFMDuct Size4 Inch (Round)Voltage Compatibility120V (Electric Clothes Dryers)Item Weight8.82 poundsUnit Count1 CountWhat’s Included in the Box?

• 1x Rysmirs 4\" Dryer Booster Fan (RF-110W1-D)

• 1x Power Cord

• 1x Connector

Shipping & Handling: Fast and secure shipping! Item will be packed carefully to ensure it arrives in perfect condition. Please verify your duct size (4-inch) and dryer voltage (120V electric) prior to purchase.