Model # WHFS24M

Internet #100018252

Store SKU #432659

0050206023853

Master Flow

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

  • 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.
$ 245 00
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Frequently Bought Together

Frequently Bought Together

Product Overview

  • 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.
The 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



Product Overview

  • 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.
Model #: WHFS24M
Sku #: 432659
Internet #: 100018252

The 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



Compare Similar

Compare Similar Products
Brand Master Flow Master Flow Cool Attic Master Flow
Name 1000 CFM Mill Power Roof Mount Attic Fan 4500 CFM 24 in. Direct Drive Whole House Fan with Shutter 24 in. Belt Drive Whole House Fan with Shutter 6000 CFM 30 in. Belt Drive Deluxe Whole House Fan with Shutter
Price
$78.00
$224.88
$251.77
$309.00
Ratings (53) (138) (208) (81)
Power Type Electric Powered Electric Powered Electric Powered Electric Powered
Wildlife Guard Yes
Ventilation Type Roof
Material Galvanized Steel Galvanized Steel Galvanized Steel Galvanized Steel
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Specifications

Dimensions

Cut-Out Width (in.)
0
Net-Free Area (Sq. In.)
1008
Product Depth (in.)
31.5
Product Height (in.)
9
Product Width (in.)
30.5

Details

Amperage (amps)
2.3
Color Family
Metallic
Color/Finish Family
White
Material
Galvanized Steel
Power Type
Electric Powered
Product Weight (lb.)
36lb
Recommended Sq. Ft.
2500
Returnable
90-Day
Voltage (volts)
120

Warranty / Certifications

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

Specifications

Dimensions

Cut-Out Width (in.)
0
Net-Free Area (Sq. In.)
1008
Product Depth (in.)
31.5
Product Height (in.)
9
Product Width (in.)
30.5

Details

Amperage (amps)
2.3
Color Family
Metallic
Color/Finish Family
White
Material
Galvanized Steel
Power Type
Electric Powered
Product Weight (lb.)
36lb
Recommended Sq. Ft.
2500
Returnable
90-Day
Voltage (volts)
120

Warranty / Certifications

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

Questions & Answers

What is the material of the SHUTTER (plastic or aluminum. Thanks

What is the material of the SHUTTER (plastic or aluminum. Thanks
Asked by: Claude
The shutter material appears to be aluminum, powder coated. It is not plastic and it is not attracted to a magnet, so I'm pretty sure it's aluminum
Answered by: DocMotors
Date published: 2018-07-24

Can this fan be installed using a wall-mounted 2-speed switch instead of the pull chain?

Can this fan be installed using a wall-mounted 2-speed switch instead of the pull chain?
Asked by: roadrunner
Yes. This unit can be install with a switch. Switch is sold separately but is worth it
Answered by: Pat
Date published: 2018-08-12

Is this fan designed to open the shutter when it is turned on simply by the force of the air that...

Is this fan designed to open the shutter when it is turned on simply by the force of the air that is being sucked through the shutter?
Asked by: chris
Yes, turning the fan on low will open the shutter. The speed can then be adjusted. If you have any other inquiries about our Master Flow products please call Technical Services at 800-211-9612.
Answered by: Master Flow
Date published: 2018-02-19

Is this fan a ceiling mount or wall mount

Is this fan a ceiling mount or wall mount
Asked by: Bigpappa
It is ceiling mount, and let me tell you how well it works..with these hot days, I turn the air conditioning on in the late am and then in the early evening we open up and turn the whole house fan on.. (you just need to crack the windows about 3 inches). It pulls in so much cold air.. when it is 65 degrees in the house, we turn the fan off... repeat as needed..
Answered by: Rae
Date published: 2018-08-16
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Customer Reviews

4500 CFM 24 in. Direct Drive Whole House Fan with Shutter is rated 3.8 out of 5 by 138.
Rated 3 out of 5 by from Good Product I had installed the 24" direct drive whole house fan. The Product was good , I have a 2300 sq. ft. house and it moved enough air to cool it down in just a few minutes. As for the installation of the fan ,if you are mechanically inclined then don't read the directions. The only thing you need is the cutout measurements. The directions are only there to confuse you. Go to YouTube and you can see a better idea on how to do it. The noise level isn't that bad, you got to expect some noise just with the the blades moving the air and cooling down the house. The noise is out weighted with the benefits it has. Just think of a night when someone burned the toast or your cooking the fish or the broccoli and it stinks-- just open the window, turn on the fan and no more smell ---it's great !!! Another good suggestion that a friend passed on to me was to paint the inner boxed in area ( the area between the under side of the fan and the top side of the shutter with BLACK paint--so when you look up into the attic through the shutters you can't see anything except black and darkness.
Date published: 2015-03-23
Rated 5 out of 5 by from 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!
Date published: 2014-05-05
Rated 4 out of 5 by from Good Fan - Cheap Switch The fan is good for the cost with a solid motor and a decently built frame. When installing additional joist support the louvre cutout is bigger than the fan frame so a complete flush frame on which the fan can sit is impossible. However, the provided plastic pieces bridge the gap well to channel airflow. My only complaint is the switch was pretty cheap and broke after 1 day of use (would not reset and allow me to shut off the fan - it stuck). Company has offered to send out another one in 5-7 days. Brother-in-law has the same fan and also had the provided chain switch break in the first week. Definitely look into constructing some kind of insulation box for summer and winter since it is literally a 30" hole in your ceiling that is only insulated by some thin plastic flaps.
Date published: 2006-08-10
Rated 3 out of 5 by from Blows a lot of air, noisy This fan has worked fine for me for over 10 years. It blows a lot of air, but I wish it were quieter. When you are close to it, you can't hear anything else. The motor finally burned out a winding. The exact replacement motor is only available from the manufacturer of the fan, which is a big disadvantage. Replacement parts should be generic and easily available, otherwise, the fan blows no air at all. If I was starting from scratch, I would look for a quieter fan with a motor that is easy to oil and replace. This is the second one I have bought and installed. The bottom line is that it blows a lot of air, lasted me over 10 years of intense use every summer, and the price was reasonable, but you have to accept that it is very noisy.
Date published: 2012-05-21
Rated 4 out of 5 by from Fan does the job. For the cost this fan does a great job. Direct drive is typically a bit noisier than belt drive and definately noisier than in line fans. However, in line fans are about four times the cost. The consistent noise easily becomes white noise. Installation is not difficult but is not for the weak! You are cutting a hole in your ceiling and need to do some electrical wiring. I installed mine in the attic access so I did not mount it on all sides. I built out a frame that the fan sits on and mounted it with hinges so I can simply push it up to access the attic. I added weather stripping to seal it and the back pressure when the fan is on really keeps it tight. Instead of the pull switch, I added a dual on/off timer switch for more control. Typically, I want the fan to go off once we fall asleep because it can get too cold if it stays on all night in So. California. Something else to remember is that you do not want to open all the windows in your house. A few strategic windows across the house works much better. It will create a breeze in the house. Bottom line is that venting the attic alone will help cool the house and a whole house fan will draw air through your house creating a nice breeze but the temperature of the air is still up to mother nature! Hope it helps.
Date published: 2010-05-03
Rated 5 out of 5 by from This was to replace an original fan from the 1950’s.... This was to replace an original fan from the 1950’s. Fan works great and is a lot quieter. Did not find the directions helpful.
Date published: 2019-04-02
Rated 4 out of 5 by from Not sure how it’s going to work as I haven’t... Not sure how it’s going to work as I haven’t got power on house yet
Date published: 2019-04-09
Rated 5 out of 5 by from Excellent product. Excellent product.
Date published: 2019-04-16
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