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

Cut-Out Left to Right Length (in.)
0
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
Product Weight (lb.)
36lb
Returnable
90-Day
Voltage (volts)
120

Warranty / Certifications

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

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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

The bushings in the motor wore out, are new bushings available to repair the motor? If not, can I...

The bushings in the motor wore out, are new bushings available to repair the motor? If not, can I get a new motor for the unit?
Asked by: TW
Contact the manufacturer via telephone at 800-755-9392 and choose the "technical help" option. Although HD only offers a 90 day warranty, the manufacturer offers a 10 year warranty. Have the 9 digit serial number (located on the back of the motor) when you call, and the manufacturer will send you a new motor, for free, via UPS.
Answered by: Mack
Date published: 2017-07-12

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
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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 99.
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 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 Great value, effective at cooling the attic and our single... Great value, effective at cooling the attic and our single story 2250 sq. ft. house. It is fairly loud, but I prefer to focus on the comfort of the reduced temperature and the savings on my A/C bills. I recommend building an insulated foam box to cover the fan in the cooler to cold months so that the house's heat is retained. If you choose to do this, you may want to take the chain off the fan for those months, so that it will not accidentally be activated.
Date published: 2017-06-16
Rated 4 out of 5 by from Will not fit 24" on center The fan itself is 24" and requires a 26.75 x 27.5 opening for the shutter. I build a box out of 2x6 to accommodate the vent shutter and installed below the drywall. I have trusses not rafters. I can not cut to install this fan and while the directions do account for this in one install option, this will not work for me as I want to use an existing opening to the attic. I dont mind the extra work for the price of this fan.
Date published: 2017-05-30
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
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