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4500 CFM 24 in. Direct Drive Whole House Fan with Shutter

$30500
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  • Direct drive motor with included 2-speed pull chain operation
  • 10-year parts limited warranty; 5-year labor limited warranty
  • Maximum house size for optimum performance: 2500 sq. ft.
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Product Details

The GAF Master Flow 4500 CFM 24 in. Direct Drive Whole-House Fan is a smart energy saver for any home in a climate where air conditioning costs are a concern. It allows you to beat the heat by forcing hot air out of your home through your attic space while bringing in cooler outside air through your windows and doors. This unit comes with a white shutter and features a low-vibration, direct drive mechanism for reliable performance. A minimum 1100 sq. ft. of attic space with a minimum of 1008 sq. in. of net free area attic exhaust is required for proper operation.
  • Powerfully moves air at a rate of up to 4500 CFM
  • 1/4 HP permanent split-capacitor motor helps move hot air out of your home
  • Direct drive motor design offers low vibration
  • 2-speed pull chain switch control for easy operation
  • Includes automatic ceiling shutter in white
  • Can be installed with no joist cutting
  • UL/UL Canada listed
  • Return Policy
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Specifications

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Questions & Answers

98Questions
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Q:Can the pull strings be shortened and a Wall controller for high and low be used?
by|Aug 31, 2022
2 Answers
Answer This Question

A:  Yes, you can replace the pull chain with a wall switch(BWS2)

by|Oct 18, 2022
    1 found this answer helpful

    A:  A high low wall controller is the preferred way to install it. A pull string isn't necessary. The hardest part of the install is the dimensions of the fan. It's wider than typical 24 in. joist spacing

    by|Sep 1, 2022
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      Q:Do you manufacture a vertically mounted whole house fan for interior wall installation?
      by|Aug 17, 2022
      1 Answer
      Answer This Question

      A:  We do not, all Master Flow Whole House Fans are designed to be mounted Horizontally in a homes' ceiling. If you have any other inquiries about our Master Flow products please email warrantyllbp@gaf.com

      by|Aug 18, 2022
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        Q:Installation instructions
        by|Aug 5, 2022
        1 Answer
        Answer This Question

        A:  Installation instructions come with the product, they are listed under "Additional Resources From the Manufacturer" on the product page as well as on the GAF website. If you have question please contact Master Flow Technical Services at warrantyllbp@gaf.com or 800-211-9612.

        by|Aug 5, 2022
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          Q:Can this be installed vertically, as in a wall ?
          by|Aug 1, 2022
          1 Answer
          Answer This Question

          A:  No, it is to be installed in ceiling per instructions. If you have any other inquiries about our Master Flow products please email warrantyllbp@gaf.com

          by|Aug 2, 2022
            Showing 1-4 of 98
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            Customer Reviews

            3.9 out of 5
            (215)
            • 3.9
              out of 215 reviews
            • 76%recommend this product
            Filter by:
            Showing 1-10 of 215 reviews
            I Installed 24" fan in garage ceiling. Fan pulls in...
            I Installed 24" fan in garage ceiling. Fan pulls in fresh cooler air not only to reduce garage temperature but also circulating cooler air into attic at location of AC air handler in attic area. Fan operates as advertised and provided directions for installation where easy to follow.
            by
            Response from Master FlowSep 15, 2022
            Thank you for the feedback. Glad you were satisfied with your Master Flow purchase. MasterFlow
            • Verified Purchase
            Does the job but loud
            It does the job, but it's loud. I don't think I've seen one thats super quiet, yet. If you expect it to be quiet like a bathroom fan or something then you'll be disappointed. If your expectations are correct, use it correctly(to clear out the air in a short amount of time then turn it off) then you'll probably be pleased with it. I only put it in because it was code in my area. I don't think our tenants will use it.
            by
            Response from Master FlowApr 20, 2022
            Thank you for the feedback. MasterFlow
              • Recommended
              Installed easily with some basic drywall, electrical, and framing knowledge. House now cools dow...
              Installed easily with some basic drywall, electrical, and framing knowledge. House now cools down quickly when outside air is colder than it is indoors. Took a few passes walking underneath it to not be nervous about me accidentally throwing my hang up into a massive metal fan spinning a couple of feet above. =)
              by
              • Verified Purchase
              • Recommended
              1 found this review helpful
              I gave this a 3 star rating because of the noise. Within 6" it measured 75 decibels. Within 4 f...
              I gave this a 3 star rating because of the noise. Within 6" it measured 75 decibels. Within 4 feet, it measured 70 decibels. I have an over joist installation with a sealed box beneath. in a 2150 Sq foot house, it moves the air around pretty good with the appropriate windows open at the other end of the house. I have over 6 feet of attic venting and about 2100 Sq feet of space up there with average heights between 4 feet and 8 feet. I can hear the fan in approximately 75% of the house. For context, 50-50 decibels is about the sound of average conversation. If I had to do it again, I would have spent another 1k on a fan harness setup where the fan is about 6-8 feet away from the ceiling vent. I believe this would reduce the sound down to about 60 decibels. Bottom line. My house is benefiting from this device. It will definitely cool down a 2150 Sq foot home in about 15-30 minutes if the outside air has dropped to comfortable levels and you have opened windows on the other end of the house. I recommend installing it in a far off room separate from the rest of the house so it can pull air all the way across the house and reduce noise in the remainder of your home.
              by
                • Recommended
                9 found this review helpful
                beefy motor . here's a pic of my custom install since old fan motor went south. motor sits level...
                beefy motor . here's a pic of my custom install since old fan motor went south. motor sits level.. custom 1x4 frame which has 1/4 inch neoprene mounts to attic box frame. motor bracings mounts atached to 1x4 frame with 1/2 inch rubber bushings. should minimize vibration/sound. had to improvise since removal of old fan..
                by
                  • Recommended
                  8 found this review helpful
                  Works GREAT!!!
                  Although I have only had this fan installed for several days, I LOVE it! I decided to go with the 24" fan because my house is less than 2200 sq. ft. and I was told that if there wasn't adequate ventilation, the 30" fan would/could make excessive noise. I'm not sure if people have difficulty installing the fan, but the way I did the install makes the fan seem "quiet". The fan noise is very comparable to a traditional box fan. I truly do not mind the noise it makes. I also put the fan on a 60 min. max timer. What I have been doing is setting the timer anywhere from 30-40 minutes, with a couple of windows open down stairs and one or two open up stairs. This cools the house down extremely fast. I am so glad I decided to put a whole house fan in our home. You should do it too! You won't be sorry!
                  by
                  • DIY
                  • Recommended
                  46 found this review helpful
                  This fan really works great. You can feel the air stream by you and it cools down the house in no time!
                  It is amazing how many people do not know what a Whole House Fan is. Even contractors. It is a very efficient way to replace the air in your house and attic just by running this fan for about 15 minutes once the air outside is cooler than the air in your house. This fan was not the biggest, but it seems to be built really well. I am very impressed!
                  by
                  • Verified Purchase
                  • Recommended
                  19 found this review helpful
                  Good fan
                  I didn't follow the directions, This is what I did and the fan is quiet. My house is 2300 sqft and it pulls the air thru nicely. I open the windows about an inch in the bedrooms and other rooms I want air to come in from the outside. My attic has vents on both ends of the house and affords plenty of exit space for the fan exhaust air. I got these Ideas off the internet and found them to be absolutely correct. First I mounted the fan in my attached garage ceiling. The fan will pull air from your home and into your attached garage ceiling. You don't have to mount it in the house. You will not get that central fan noise in the house that way. We have a screen door in the kitchen that goes to the garage. The air flows out thru the screen door. The next thing I did was to build a box for the fan to sit in on top of the ceiling joists. I cut the center joist and boxed it in. Then built a frame to hold the fan on top of the joists. I cut lengths of pipe insulation to fit on the fan wood frame. The glue on the insulation seam holds the insulation on the frame.$1.79 each for 2 insulation tubes at HD. The frame, is snug to the insulation but not tight. Hence when the fan runs, it is not vibrating on wood to wood contact. All you hear is the fan blade turning like you would any fan. There is a pull chain to turn it on and off. It is a 2 speed fan. I run it on high. I used the same size wood the ceiling joist were made of, to box in the joists where I cut one out. I used 2x4 s to make the box on top of the joists. I used a sawzall to cut the sheetrock, and the center joist. If you bridge across the top of your joists before you cut the center joist, you will not get any sag from the two ends of the cut joist. All will be strong after you box them in. I attached a wire and a plug on the fan wire to power the fan. I plugged it in to a receptacle in the attic. The pull chain is right outside the kitchen door in the garage.
                  by
                    • Recommended
                    67 found this review helpful
                    Works great. Craftsman installed and is cooling our house.
                    Works great. Craftsman installed and is cooling our house.
                    by
                    Response from Master FlowOct 14, 2022
                    Thank you for the feedback. Glad you were satisfied with your Master Flow purchase. MasterFlow
                    • Verified Purchase
                    • Recommended
                    by
                    • Verified Purchase
                    Showing 1-10 of 215 reviews

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                    Ratings
                    (113)
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                    Coverage Area (Sq.Ft)250025003000736
                    Airflow (CFM)4500450060001472
                    Product Width (in.)5.12530.533.7514
                    Decibel (Sound) Rating01-Not Measured01-Not Measured01-Not Measured43 dBA
                    Drive TypeDirect DriveDirect DriveBelt DriveDirect Drive
                    Horsepower (hp)1/41/41/30
                    Motor Speed (RPM)1075 RPM1075 RPM11000
                    Product Height (in.)691138
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