Model # WHFS24M

Internet #100018252

Store SKU #432659

Master Flow 4500 CFM 24 in. Direct Drive Whole House Fan with Shutter
0050206023853

Master Flow

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

  • 10-year parts limited warranty; 5-year labor limited warranty
  • Direct drive motor delivers superior, low-vibe operation
  • Maximum house size for optimum performance: 2500 sq. ft.
$24500 /each

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Product Overview

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

Specifications

Dimensions

Details

Warranty / Certifications

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Customer Questions & Answers

Can this fan be connected to a variable speed control?

Asked by: stuntmanmike
I installed a whole house fan with a two speed pull chain split capacitor motor about 12 years ago in my house. It was not this model but was what Home Depot was carrying at that time. The instructions also stated that the warranty would be voided if one was installed. I left the pull chain in the high "on" position and installed a wall mount variable speed control rated for a ceiling fan. I always start the fan on high and never turn it down too low. I judge the "too low" by visual observation of louver position. I have never had any issues with the operation of the fan.
Answered by: JGGH
Date published: 2017-03-15

Can this unit be mounted on a wall?

Asked by: Dale
I have this same fan mounted in a wall of my shop although it is not recomended to be mounted this way mine was used when i got it and it lasted aprox. 9 years. the rear bearing is a shielded ball bearing and the front is a bronze oil light bearing.. mine just siezed up this month because there is no way to oil the bronze bearing on the front.. so yes it can be done but the make fans designed for wall mounting and this is meant for a ceiling mount so that the ball bearing in the rear of the motor can act as a thrust bearing and all the front )blade end) is only there to keep the rotor centerd in the stator
Answered by: Scott
Date published: 2017-02-11

can I put this fan in an attic window?

Asked by: westmainmusic
No, this fan is only approved or designed for Horizontal installation only. Please call MasterFlow Technical Services at 800-211-9612, M-F 8A-5P EDT, for any additional questions.
Answered by: Master Flow
Date published: 2016-09-20

how to turn off and on manually

what kind of switch do you use to turn it on and off. it doesn't come with switch and you have to wire one in. so what would I use?
Asked by: carmen
This product comes with a pull chain switch. It can be converted to a wall switch operation by adding a BWS2 wall switch. Please call Technical Services at 800-211-9612, M-F 8A-5P EDT, with any additional questions.
Answered by: Master Flow
Date published: 2016-09-05
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Customer Reviews

4500 CFM 24 in. Direct Drive Whole House Fan with Shutter is rated 3.7 out of 5 by 93.
Rated 4 out of 5 by from I bought this fan to use in the shop fan works great but I was disappointed with the store. I ord... I bought this fan to use in the shop fan works great but I was disappointed with the store. I ordered it online and picked it up from the store when I did it was open so I asked why and they said they open it to make sure it is good. so I thought nothing of it and took it home 2 weeks later I am installing it and figure out it has been installed and brought back but I didn't figure it out till I had it mounted and figured out the pull chain switch was broke and the spacers where cut already. since I was doing the wall mounted switch and I already had it mounted and live 45 miles away, I didn't return it but if you have a open box or re-taped than beware.
Date published: 2016-12-13
Rated 4 out of 5 by from as you can see from previous review..all is well. quiet enough to sleep at night, mounted in a 2n... as you can see from previous review..all is well. quiet enough to sleep at night, mounted in a 2nd story ceiling in a bungalow. had to balance on the lil'l giant ladder with 2x10 plank to install this isn't your typical install given the picture, you'll notice i couldn't set the frame on rafters due to short ceiling clearance. long story. this is a custom install given what i have to work with. overall it works. con's had to run to local hardware to purchase white capped screws and nylon washers for louver install. 6 total. not provided.
Date published: 2017-05-10
Rated 4 out of 5 by from I would say the Product works great and was very easy to install. After going thru the whole hole... I would say the Product works great and was very easy to install. After going thru the whole hole cutting process in a Plaster ceiling; but i wrapped the louvers in pine and the finished product looks great as well. As far as the draft I probably could have gone with the 30" fan for my 1234 sqft house but the descriptions on these are very intimidating with how much exhaust area you need but all and all great product and easy install definitely would and will recommend this.
Date published: 2017-04-18
Rated 4 out of 5 by from 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..
Date published: 2017-05-06
Rated 5 out of 5 by from Well, the short term test is in. Runs quieter or equal to a box fan, which is good given the numb... Well, the short term test is in. Runs quieter or equal to a box fan, which is good given the number of air cubits it's moving. I've learned that if the motor seems to be choppy, on low speed, open more windows or doors. hope this helped..
Date published: 2017-05-13
Rated 1 out of 5 by from I have now installed my third unit in less than 3 years of the Master Flow 24 in. Direct Drive Wh... I have now installed my third unit in less than 3 years of the Master Flow 24 in. Direct Drive Whole House Fan because the motors keep burning out. Terrible quality, I do not recommend wasting your time having to keep replacing the unit.
Date published: 2017-03-19
Rated 4 out of 5 by from Loud, but effective I have owned several homes with whole house fans ... this is the loudest one I have heard. However, if you have a hallway to the garage or other out of the way location, it is not too bad. If you go with the standard "over joist" mount, plan on cutting up two two by fours to build a base around the joist, and if you have blown in insulation, plan to cut up two six foot one by tens to build a box that extends above the fan to hold back the insulation. It takes only a few minutes to draw cool air through the entire house. Only wish is that the low speed would be lower. Even low still creates quite a breeze through the house!
Date published: 2011-06-25
Rated 5 out of 5 by from Great product! I have installed these fans for numerous customers. The installation process is not that difficult. I've never had a problem with the product or a call-back from a customer.
Date published: 2017-05-02
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