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Internet # 100018252

Model # WHFS24M

Store SKU # 432659

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

$329.00
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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

About This Product

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.

Highlights

  • Don't know how much to order? A GAF QuickMeasure report provides all of the measurement data you need when planning your material orders. A complete bill of materials, with Home Depot product SKUs, is provided with each single-family report delivered in under 1 hour. Learn more here. [gaf.com [gaf.com]]
  • 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

Product Information

Internet # 100018252

Model # WHFS24M

Store SKU # 432659

Specifications

Dimensions: H 9 in, W 30.5 in, D 31.5 in

Dimensions

Coverage Area (Sq.Ft)

2500

Cut-Out Width (in.)

27.25 in

Net-Free Area (Sq. In.)

1008

Product Depth (in.)

31.5 in

Product Height (in.)

9 in

Product Width (in.)

30.5 in

Details

Airflow (CFM)

4500

Amperage (A)

2.3

Color Family

Metallic

Color/Finish

White

Decibel (Sound) Rating

01-Not Measured

Drive Type

Direct Drive

Features

Speed Control

Horsepower (hp)

1/4

Intake/Exhaust

Exhaust

Material

Galvanized Steel

Max. Motor Speed (RPM)

1075 RPM

Mounting Position

Ceiling

Product Weight (lb.)

36 lb

Returnable

90-Day

Voltage (volts)

120

Warranty / Certifications

Manufacturer Warranty

10-year Parts Limited Warranty 5-year Labor Limited Warranty

Questions & Answers

120Questions
caret
Q:My ceiling joists are on 24” centers. Will I need to cut them to install this fan? It says it’s a 24” fan but several questions say the rough opening is over 27” which means I would need to cut the joists to install.
by|May 11, 2024
1 Answer
Answer This Question

A:  The fan is 27 3/4 x 27 3/4 outside dimension, this fan can be installed on top of the joists, click on the "Instructions/Assembly" under additional resources for the installation instructions.

by|May 13, 2024
    caret
    Q:What is the CFM at the low speed setting?
    by|May 2, 2024
    1 Answer
    Answer This Question

    A:  The CFM rating at Low Speed is 3150. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com

    by|May 2, 2024
      caret
      Q:I have a 1700 sq foot townhome. What is the best size (CFM) fan to install
      by|Jan 22, 2024
      1 Answer
      Answer This Question

      A:  We will need more information, please email Masterflowtech@gaf.com with the attic square footage and the amount of exhaust you have. Our Whole House fans require at least 1000 sq feet of attic space and over 1000 sq inches of exhaust.

      by|May 15, 2024
        caret
        Q:Rough open for 24inch attic fan
        by|Oct 2, 2023
        1 Answer
        Answer This Question

        A:  The cut-out or rough opening for our 24" WHF Shutter is 27 1/4" x 28 1/4" with an overall size of 30": x 30 1/4". If you have any other inquiries about our Master Flow products please email warrantyllbp@gaf.com

        by|Oct 6, 2023
          Showing 1-4 of 120

          Customer Reviews

          3.9 out of 5

          • 3.9 out of 231 reviews
          • 77% recommend this product
          Filter by:
          Showing 1-10 of 231 reviews
          A little difficult to assemble because I was nervous about cutting the rafters. once I braved that fear, it became much easier. It seems to work well but it is loud! It does move the air though. I bought this to replace a box fan in the upstairs window since that room will now be occupied. Oddly enough it doesn’t seem to cool the house anymore than the old box fan in the window. My only complaint is that the specs on Home Depot say it pulls ~1.2 amps but the motor said 5 amps. That means it costs nearly 5 times as much to run vs what I expected when researching and buying.
          by
          Response from Master FlowApr 22, 2024
          Glad you were satisfied with your Master Flow purchase. Thank you for the feedback and we value your concerns. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
          • Verified Purchase
          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
            2 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
              10 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
                  69 found this review helpful
                  The fan works great. Just be sure you follow the directions on the cut out to be sure the hole is big enough for the shutter arms to open and close on their own.
                  by
                  Response from Master FlowMay 17, 2024
                  Glad you are satisfied with your Master Flow purchase. Thank you for the feedback and we value your concerns. If you have any other inquiries about our Master Flow products please email, masterflowtech@gaf.com MasterFlow
                  • Verified Purchase
                  Showing 1-10 of 231 reviews

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