Spruce Dryer Fan Booster Kit 121 CFM (SDB110P) w/Pressure Switch Kit

Product details (archived)

The information below is retained for reference only. This item is discontinued and cannot be ordered.

Spruce Dryer Fan Booster Kit 121 CFM (SDB110P) with Pressure Switch Kit.

Dryer booster fans are designed to solve common dryer performance issues caused by long or restrictive duct runs. When dryers are installed far from exterior walls, airflow can be reduced, leading to longer drying times, excess lint buildup, and unnecessary strain on the appliance. An in-line dryer booster fan restores proper airflow, improving dryer efficiency and helping maintain better indoor air quality.

The RB110 Dryer Booster Fan uses a compact, motorized impeller to deliver powerful, virtually silent airflow where it’s needed most. It is ideal for dryer vent boosting in residential and multi-family applications, including luxury homes, apartments, and condominiums. The RB110 is recommended when the total dryer duct length exceeds the manufacturer’s maximum—typically 25 feet—or includes multiple bends that restrict airflow.

By increasing airflow through the exhaust system, a dryer booster fan reduces drying times, improves overall system performance, and minimizes wear on the dryer. The RB110 can be operated using a timer, manual switch, or automatic pressure-sensing switch, and is available as a standalone fan or as part of a complete kit for hands-free operation. Adding a dryer booster fan helps eliminate wasted time, energy, and unnecessary appliance stress.

Features:

• 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

Specifications:

• 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:

• Mounting bracket.
• 1 pressure sensing switch.
• 1 probe and three-foot length of vinyl tubing.
• Instruction manual.
• 1 year limited manufacturers warranty.

Booster Instructions (PDF format)

RB-Series Owners Maual (PDF format)