Add $50.00 for FREE shipping
Up to 20% Off Insteon Starter Kits!Free Shipping On Orders $50 And Up
Fan Type
Booster Fans
Duct Size
8" Duct
110V AC
Ease of Installation
Advanced (Installs > 60 minutes)
Other Ways to Shop
In Stock
On Sale
Order the Smarthome Catalog

Make your Existing HVAC System More Effective
Tjernlund EF-8 AUTO Automatic Duct Booster Fan - 8 Inches
Tjernlund EF-8 AUTO Automatic Duct Booster Fan - 8 Inches
Tjernlund EF-8 AUTO Automatic Duct Booster Fan - 8 Inches
Item# 32521
Price: Normally $330.00 
Hot Deal $149.96
Free shipping on orders over $50 - See Details


  • Heavy gauge housing with metal prop fan blades
  • Can be installed in less than 10 minutes - insert it into the duct run and plug it in
  • Withstands air temperatures up to 150 degrees F (65 degrees C)
  • Can be installed in metal or flex ducting

Essential Info

This fan features a 115 VAC power cord and built-in Pressure Response Control (PRC) unit to automatically operate when your forced air system is running. When positive pressure is sensed, the PRC turns the fan on to channel the hot or cool air into the selected room. Pressure checks are performed repeatedly to determine whether the fan should continue to run. The fan will even continue to run for a short time after the heating or cooling system has turned off to ensure every last bit of the heated or cooled air makes its way out of the duct.

Heavy gauge steel housing and metal prop fan blades make this duct booster fan ultra-durable. If installed where your system’s filters are properly positioned and maintained, this fan or its motor will not require any cleaning. The fan’s operation will be so smooth and quiet you might forget that it is running.


What's Included

  • 1x - 8-Inch Automatic Duct Booster Fan
  • 1x - Owner's Manual

  • Specifications

    Manufacturer Product No.EF-8 AUTO
    Motor RPM3000
    Cord Length5 feet
    Dimensions8" Diameter x 9" D
    Weight4.94 lbs
    Warranty1 year, limited
    Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: Tjernlund Products Inc, Tel: (800) 255-4208 Ext


    3 Ratings
    5 star: 67%  (2)
    4 star: 33%  (1)
    3 star: 0%  (0)
    2 star: 0%  (0)
    1 star: 0%  (0)
    Average Customer Rating
    (3 customer ratings)
    Share your thoughts with other customers
    CARLO -- windham, NH   7/29/2013
    The unit is excellent and does the job well!
    VAHE -- laguna hills, CA   1/19/2012
    So far the booster fan works well and it was simple & straight forward to install. Happy with it up to this point... I'm curious to see the longevity of this product.

    Related Items

    Customers Also Bought

    Sign-up for Exclusive Email offers 
    How to Order Track Your Package Shipping Returns Contact Us Customer Service Retail Store
    Getting Started Learning Center FAQ Dealers Customer Testimonials Affiliate Program
    About Us INSTEON Press Awards Employment Guarantees Security & Privacy
    Free Catalog Email Newsletter Forum RSS Site Map
    Have questions? Call us at 800-762-7846 (Mon-Fri 5am-7pm and Sat 6am-3pm PT) or send us a message
    Place your order by 3pm PT for same day shipping
    Copyright 1995-2014 SMARTHOME™
    Verisign Secure Site PayPal Acceptance Mark