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Fan Type
Booster Fans
110V AC
Ease of Installation
Intermediate (Installs < 60 minutes)
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Ultra-Quiet and Energy Efficient Fan Lies Flush When Installed Into Standard Register Boots
Tjernlund RB12 Air Register Booster Fan - 4 x 12 Inches
Tjernlund RB12 Air Register Booster Fan - 4 x 12 Inches
Tjernlund RB12 Air Register Booster Fan - 4 x 12 Inches
Item# 32526
Price: Normally $198.00 
Hot Deal $105.08
Free shipping on orders over $175 - See Details


  • Installs into existing register boots
  • On/off toggle switch for easy operation
  • Low profile design lies flush with carpet or wood flooring
  • Grille can be painted to match any d├ęcor
  • Energy-efficient and costs only about $5 a year to operate

Essential Info

Designed for installations that will not accommodate standard in-line Duct Booster fans, this register fan installs directly into your floor and delivers hot or cold air from your HVAC system. Installation into existing register boots only takes a few minutes. No hard-wiring is required; simply plug the attached 6-foot power cord into the nearest electrical outlet. The air flow will instantly be strengthened and the booster fan will operate quietly to not distract you from your task at hand. The fan's low sone cross flow blower enables it to be 50% quieter and eliminates buzzing that can be heard from typical booster fans. An on/off toggle switch lies beneath the grille to turn the unit completely off when you don't want it running.


What's Included

  • 1x - Duct Booster Register Booster Fan
  • 1x - Main unit grille
  • 1x - Diffuser
  • Mounting hardware

  • Specifications

    Manufacturer Product No.RB12
    Air Delivery (CFM)75
    Warranty1 year, limited
    Important notes:
    Only defective exchanges for identical item within 30 days of purchase. No other returns allowed on this item. For defective returns after 30 days, please contact the manufacturer.
    Manufacturer contact information: Tjernlund Products Inc, Tel: (800) 255-4208 Ext


    5 Ratings
    5 star: 20%  (1)
    4 star: 60%  (3)
    3 star: 0%  (0)
    2 star: 0%  (0)
    1 star: 20%  (1)
    Average Customer Rating
    (5 customer ratings)
    Share your thoughts with other customers
    JAIME -- missoula, MT   10/8/2013
    Fan is quiet and fit right into the 4x12 floor register.
    Unhappy customer. -- California   7/24/2013
    Unit emits loud, high-pitched whine in operation. Was not tolerable for me. Smarthome would not accept for return.
    RAYMOND -- ham lake, MN   12/28/2012
    its quiet, the hard to heat room is now comfortable. I recommend this product.
    Paul Bates -- dearborn, MI   11/7/2011
    Powerful, maybe too much so. I have an older section of my house where the insulation is not as good and only one duct feeding a large bedroom. I put one of these in. It was a 1940's register so I had to buy a new replacement and do some metal work on it. I have a Homeseer homeautomation system and used a ICON Relay - INSTEON Appliance Module to automatically activate the booster about a minute after the furnace kicked on. It comes on and really moves a lot of air. While you can hear it working, its not objectionable. Here's the but..... the placement of the duct put it near the bed. It blows so much air that the occupant felt cold from the breeze Two suggestions: 1 Don't plan to use it if the register is wall mounted / points direclty at where the occupants will stand, sit or sleep. 2 Buy the optional variable speed control, or buy an automation control that can dim a load. Also, if using automation, have it wait about a minute after the furnace on is detected to allow warm air to fill the duct.

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