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Spruce Dryer Fan Booster Kit 121 CFM (SDB110C) w/Current Switch

Model #: 28259

UPC: 0667829282590

Condition: New


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Dryer booster fans are usually installed when homeowners realize that their dryers are not drying clothes well or that they are experiencing an excess buildup of lint. Dryer booster fans improve indoor air quality while increasing the airflow and efficiency of your clothes dryer.

Dryer booster inline fan, powered by a motorized impeller, can create larger airflow where needed for virtually silent duct boosting and living area ventilation. The compact yet powerful RB110 is ideal for use in dryer boosting. In many of today's homes, dryers are being installed away from exterior walls requiring longer duct runs, which compromise dryer efficiency. Use a RB110 Dryer Boost Fan when the total duct run exceeds the manufacturer's recommendation. (typically 25 feet). Ideal for luxury homes, apartments, condominiums and multi-family dwellings. Operates using a timer, manual switch or automatic current-sensing switch.

Dryer boosting increases airflow and efficiency of clothes drying system. Adding an in-line auxiliary fan to a drying system with long duct runs or multiple bends boosts system capacity resulting in shorter drying times and reduced wear and tear on the dryer. The fan is available separately or as part of a kit that includes everything necessary for a hands-free operation. Install a dryer boost and you will no longer waste time or energy.


  • Fan housing constructed of heavy-duty engineered thermoplastic that is durable, corrosion resistant and flame retardant.
  • Internal air turning vanes provided for maximum air performance.
  • External rotor type motorized impeller, class B insulation, totally enclosed with permanent split capacitor.
  • Permanently sealed self-lubricating ball bearing type motor.
  • Motor equipped with automatic reset thermal overload protection.
  • Continuous duty motor Sufficient service factor is provided to ensure long maintenance-free operation over maximum load conditions.
  • Motorized impeller is both statically and dynamically balanced as one integral unit to provide for vibration free performance.
  • Fully automatic pressure switch
  • Suitable for up to 60 foot runs with no more than six 90° elbows
  • Ultra quiet operation
  • Rated for commercial or residential installations
  • Lightweight durable construction
  • Rated for continuous operation
  • uL & ETL Code Approval
  • Fan air flow and sound performance certified by HVI and licensed to bear the HVI Certified Ratings seal

Dryer boosting is usually required when the total duct length exceeds the following:

  • 25 feet: with 0 bends
  • 20 feet: with 1 bends
  • 15 feet: with 2 bends
  • 10 feet: with 3 bends


  • Air flow
    • 121 CFM at: 0.0" Water Column.
    • 100 CFM at: 0.2" Water Column.
    • 68 CFM at: 0.5" Water Column.
    • 20 CFM at: 0.75" Water Column.
  • Wattage: 14 to 20.
  • Duct size: 4”.
  • Dimensions: 8.5” x 9.7” diameter.

Supplied with:

  • 1 current sensing switch
  • Instruction manual
  • 1 year limited manufacturers warranty

Download RB110 Dryer Booster Instructions (PDF format)

Download RB-Series Owners Maual(PDF format)

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