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

  • 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.
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

  • 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.
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

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Name 24 in. Belt Drive Whole House Fan with Shutter 4500 CFM 24 in. Direct Drive Whole House Fan with Shutter 30 in. Belt Drive Whole House Fan with Shutter 30 in. Direct Drive Whole House Fan with Shutter
Brand Cool Attic Master Flow Cool Attic Cool Attic
Ratings (177) (104) (38) (40)
Cut-Out Left to Right Length (in.) 27.75 in 0 32 in 32 in
View Product View Product View Product View Product

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

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

Questions & Answers

what is the cubic feet per minute (CFM) flow rating?

what is the cubic feet per minute (CFM) flow rating?
Asked by: TP
The cubic feet per minute rating is 4500 on high and 3150 on Low. 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: 2017-09-18

Noise

What is the decibel level of this fan when it is operating?
Asked by: kwanlu
I have just installed this device in my mudroom. It has 15" of clearance on all sides. My ceiling is 8 feet high and level. My attic is approximately 2150 Square Feet with 50% of it with an average space/height of 4 feet and the other 50% with an average space/height of 8 feet. I have heard it referred to as a scissor truss attic setup. I have 7 square feet of attic venting and about 7.5 feet of space between the top of my fan and the actual roof. Using a Samsung Galaxy S7 and a freely downloaded decibel meter I got a reading of 76 decibels within 6" of the unit and 71 decibels at 4 feet from the unit. The meter rates this at the relative level of Loud Music while 50-55 decibels rates as Conversation. If I had to compare it to something I'd say it was louder than a large window box fan and maybe louder than a large washing machine with a heavy load on spin cycle encountering some small vibration. I have to admit, I don't mind a loud fan as I usually sleep with one but this puppy cranks out some sound and I'm a little discouraged by it. You can hear it through 75% of the house. It moves a decent amount of air with the windows open at the back side of the house but I'm wondering if I should have spent another 1k to upgrade to a fan that harnesses the fan motor much farther away in the attic with a connector vent down to the ceiling. I hope this helps.
Answered by: TomWilliamsJr
Date published: 2017-09-06

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
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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 104.
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 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 3 out of 5 by from 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.
Date published: 2017-09-06
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 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 What a great product. Cools your entire home and leaves it smelling fresh. Bring the outside ai... What a great product. Cools your entire home and leaves it smelling fresh. Bring the outside air in, it's unlikely I'll ever own a home without one. I replaced a previous unit (10 yr old). The only issue was the replacement louvers assembly was slightly smaller and required some adjusting to make work.
Date published: 2017-10-03
Rated 5 out of 5 by from Easy installation. Balanced well and runs quiet for the... Easy installation. Balanced well and runs quiet for the size of the fan. Even on low setting creates a strong flow of air through our home. Vent requires 4 or 6 inches to operate (cannot recall). I had to build a surround below the ceiling joists for the vent to open and close properly.
Date published: 2017-08-02
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