Add $175.00 for FREE shipping
Shop All!
Fan Type
Booster Fans
Duct Size
4" Duct
110V AC
Ease of Installation
Advanced (Installs > 60 minutes)
Other Ways to Shop
Customer Favorites
On Sale
Quantity Discount Available
Order the Smarthome Catalog

Boost the Airflow to Poorly Ventilated Rooms!
4-In 110VAC 80CFM In-Line Duct Fan
Click for larger image and other views
Installation Diagram (with DuctStat)
4-Inch 110vac 80cfm Inline Duct Booster Fan
Item# 3016
Price: Normally $29.95 
Hot Deal $22.92
Open Box (Qty:6) $18.34 ea - Add to cart
Free shipping on orders over $175 - See Details


  • Installs in metal or flexible ducts
  • Boost airflow to selected areas
  • Use as a super quiet bathroom exhaust fan
  • Use to assist ventilation
  • 80 cubic ft. maximum air flow per minute

Essential Info

Imagine being able to walk into a room, press a button and have the airflow only to that room immediately boosted by up to 80 percent-quietly. Increase ventilation to selected areas when guests are over, equalize temperatures in rooms that are too hot or too cold, or build your own power-circulated HVAC system. Installation is easy: Simply cut the flexible or rigid duct where you want the fan installed, insert the duct, and then seal the duct with a nylon strap (for flexible ducts) or sheet metal screws (for rigid ducts).

This 4-Inch In-Line Duct Fan uses high-performance balanced polycarbonate fan blades, and the fan comes with approximately 6-inch wire leads.


What's Included

  • 1x - 4 inch 110VAC 80CFM In-Line Duct Fan - DB204
  • More Info

    In-Line Duct Fans can be wired directly to a wall switch for manual control or to an HVAC system (an optional 110V relay may be required). To turn on the duct fan automatically only when there is air flow, just add the optional #3018 DuctStat Duct Fan Thermostat. The DuctStat requires that the duct fan have a 110V plug end.



    Manufacturer Product No.:DB204
    Duct Diameter:4"
    Unit Weight:4.50 Lbs.
    Max Boost CFM:80
    Free Air CFM:65
    Housing Length:6"
    Blade Type:Polycarbonate
    Motor:110V, Class B, Thermally Protected (T.P.)
    Performance:Fan performance chart

    Important notes:
    Defective exchanges for identical item within 30 days of purchase. After 30 days, please contact the manufacturer.
    Manufacturer contact information: Suncourt Inc, Tel: (800) 999-3267


    Installation Diagram (with DuctStat)       
    Installation Diagram (with DuctStat)       


    85 Ratings
    5 star: 54%  (46)
    4 star: 22%  (19)
    3 star: 9%  (8)
    2 star: 4%  (3)
    1 star: 11%  (9)
    Average Customer Rating
    (85 customer ratings)
    Share your thoughts with other customers
    ROBERT -- west liberty, OH   11/30/2012
    Good fan for what I used it for. If this is someone trying to boost a lot of airflow this is not the fan for you. I used it on a solar furnace where I want the air to move through it slower so the heat does not disapate fast. Works Great!
    DAVID -- lodi, WI   10/25/2012
    So far, works good.
    GARRY -- port alberni, BC   9/27/2012
    Works well. Fairly quite.
    BENBROOK -- columbus, OH   3/29/2012
    Item ordered was shipped quickly. The fan is fairly quiet (considering it is inside a tube) and as powerful as expected.
    DAVID -- orlando, FL   1/20/2012
    Good product at a good price.
    RICHARD -- hazleton, PA   1/3/2012
    Service and shipping was great. The price for the fan was a great price. The reason for only 2 stars was because the longer the fan runs it starts to make noise. Proably not woth the shipping cost to send back for replacement.
    MARY -- hillsborough, NC   11/25/2011
    The inline duct booster fan is quiet and easy to install. It doesn't move much air but to me that is a desirable feature.
    JESSICA -- belden, NE   10/13/2011
    great product quiet and works well i would like to get more cfm next time but it is still a great fan
    ROGER -- dartmouth, NS   7/4/2011
    The fan was delivered in a resonable length of time and the product was as I expected it to be.
    JAMES -- panama city, FL   3/14/2011
    Excellent fan for the price.... I previously used bathroom ceiling fan for my application and now I can move more air on a continuous basis. Easy to install and simple to hook up. Thanks. Jim Walder
    CLARENCE -- fishtail, MT   3/13/2011
    Quick delivery - product as advertised.
    SOLAR -- san diego, CA   1/15/2011
    fan did not produce a strong enough gust
    JACK F -- pensacola, FL   1/6/2011
    Good product at an excellent price. Would buy from again.
    DEL -- spicewood, TX   1/4/2011
    Been running the fan 24/7 for the last two weeks and no problems. Fan is very quiet. So far so good.
    LINDA -- gun barrel city, TX   12/18/2010
    Works like a champ considering getting another a little later.
    KAYNE -- boxboro, MA   12/9/2010
    Good quality. It works!
    JAY -- sutherlin, OR   11/28/2010
    These things rock!
    Rich -- barrington, NH   10/30/2010
    Not good volume and CFM is weak with ANY restriction such as a sheet of paper. Perhaps if it were deeper in a duct as it seems the turbulance actually causes a reverse effect vac
    MO INVESTMENTS -- vancouver, BC   10/8/2010
    Great value for the money. Quiet and effective fan. Works well with the Duct Fan Thermostat.
    JUDITH -- fairbanks, AK   10/1/2010
    Good value, easy to install, does exactly what I needed. The whole transaction was simple, quick, and very satisfactory. I have a pet gripe about "mail-order" companies who gouge us Alaskan residents on shipping (postage is the same from anywhere in US to Alaska as it is to California or any other US state but some companies charge as much as 6 times the actual cost, as though shipping to Alaska is a special rate or a hassle). SmartHome doesn't do this and I will continue to buy from them in the future in part because of this.

    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