Model # CX24BDM-2SPD

Internet #203931021

Cool Attic 24 in. Belt Drive Whole House Fan with Shutter
0047242542226

Cool Attic

24 in. Belt Drive Whole House Fan with Shutter

$226.59 /each

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Product Overview

The cool attic 24 in. belt drive 2-speed whole house fan is designed for houses with 1,200 to 1,800 sq. ft. attics. It offers an efficient way to reduce cooling costs, while keeping your whole house more comfortable. It works by pulling fresh air in from the outside and expelling the warm air up into the attic and pushing it out through your attic exhaust vents. This unit requires a minimum of 8-10 sq. ft. of net free exhaust vent area to perform quietly and efficiently. Dual, self-aligning ball bearing mechanisms, and precision-balanced 4-blade aluminum fan assembly, contribute to quiet, reliable performance and longevity.

  • 2-speed, 1/3 HP, thermally protected PSC motor
  • CFM high and low ratings at 4600 and 3200
  • Joist-in and joist out installation option
  • White, powder coated, ceiling mount, automatic shutter with 95% plus closure
  • Decor-style, dual on/off high/low function white wall switch included
  • Steel venture for durability
  • Rough opening: 26 in. x 28 in. - outside shutter dimensions: 27-3/4 in. x 29-3/4 in.
  • UL/CUL listed
  • 10-year limited warranty
  • Whole house fans are designed for ceiling mount installations only, please do not purchase a whole house fan if you are seeking a fan for wall exhaust use
  • Click here for more information on Electronic Recycling Programs

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Customer Questions & Answers

22 Questions66 Answers

Customer Questions & Answers

24 in. Belt Drive Whole House Fan with Shutter
24 in. Belt Drive Whole House Fan with Shutter

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8 answers

Does anyone know if normal operation is for the fan to only turn on when speed switch is set to high?

This question is from 24 in. Belt Drive Whole House Fan with Shutter
Asked by
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October 30, 2015
Just had this whole house fan installed and the installing is telling me that the fan will turn on only when the speed switch is set to high? When the switch is set to low and the power switch is turned on the fan doesn't turn on. Is this normal operation for this fan? I had a whole house fan in my previous house and it was able to start in low. The installer is ensuring me that it was installed per the mfg'ers instruction. So maybe I have a faulty fan?

Thanks for your help.
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Answers (8)

Asked by
Northern Kentucky
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Home Improvement Profile: DIYer
May 5, 2016
Answer: 
I have the same fan as you do - installed it a couple months ago. It turns on from both low and high speed switch positions. Guessing that your switch is either wired incorrectly, or it's bad.
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Asked by
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November 6, 2015
Answer: 
@Trackman8: The problem was the belt was too tight. Once it was loosened it would start in low with no problem. I did contact the manufacturer and they recommended starting in low in order to reduce the strain on the motor at start ups.
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Asked by
Hammond, In.
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Home Improvement Profile: Other
November 5, 2015
Answer: 
We had a pro install our fan and it starts up the way it should. (the wiring was quite a challenge, even for him). The switches are of ho-hum quality, maybe that is the issue. I always start the fan on high, then go back to low.I understand that this is less of a strain on the motor on start-up.This is all I can offer as advice. Good Hunting. Trackman8...
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Asked by
Orlando, fl
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November 3, 2015
Answer: 
No. I use my fan on low most of the time. Check your wiring. The diagram shown is a rear view.
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Asked by
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November 2, 2015
Answer: 
The fan does run in low speed after it's turned on in high speed then after it's running the switch is turned to low. After further research we loosened the belt and now it will turn on when the switch is first set to low. Problem solved.
Note to everyone, this is not a Heat Stream product. It's a Cool Attic by Ventamatic.
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Asked by
Plano, Texas
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Home Improvement Profile: DIYer
November 1, 2015
Answer: 
No, your installer is wrong. I start and run my fan on low most of the time.
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Asked by
Baltimore,Md.
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Home Improvement Profile: Professional
November 1, 2015
Answer: 
No, this is not the normal operation of this fan.
Unless you are good with electrical systems you will need an Electrician to determine if the problem is with the motor or the fan. I would bet that the problem is in the switch. Some of the cheaper switches are known to fail out of the box.
What would need to be done is the switch would need to be pulled out of the mounting box, AFTER TURNING OFF THE
Read More
No, this is not the normal operation of this fan.
Unless you are good with electrical systems you will need an Electrician to determine if the problem is with the motor or the fan. I would bet that the problem is in the switch. Some of the cheaper switches are known to fail out of the box.
What would need to be done is the switch would need to be pulled out of the mounting box, AFTER TURNING OFF THE POWER, and tested for continuity from the power side to the high and low wires to the fan. It could be a simple thing like they connected the power feed to the output wire and connected the fan wire to the input wire.
But again someone who has a good working knowledge of Electrical systems should look at it. It may cost you a few bucks but that way you will have a definite answer.
Good Luck Read Less
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Asked by
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October 31, 2015
Answer: 
It is always possible that the fan or switch is defective, but honestly from what you have described it sounds like improper installation, specifically improper wiring. My initial guess would be the installer used 14/2 wire instead of the 14/3 wire required to run the fan on low and high.
See the attachment I have added. It is a very crude diagram The wire feeding the on/off switch should be 14/2. It Read More
It is always possible that the fan or switch is defective, but honestly from what you have described it sounds like improper installation, specifically improper wiring. My initial guess would be the installer used 14/2 wire instead of the 14/3 wire required to run the fan on low and high.
See the attachment I have added. It is a very crude diagram The wire feeding the on/off switch should be 14/2. It will have a black wire (hot), a white wire (neutral, shown on my drawing in gray), and a bare copper ground (not shown in my drawing). The wire running from the on/off switch to the high/low switch should be 14/2.
The wire running from the high/low switch should be 14/3 and will have an extra red wire in it. Red is also hot. This permits the high/low switch to feed a lower amount of power to the fan for the low setting (on the red wire, according to the instructions) and a higher amount of power for the high setting (on the black wire according to the instructions). If there are not two separate "hot" wires running from the high/low switch, then the fan will not run on two different speeds.
This can be easily checked by you by taking the cover plate off the box that your installer put the switches in. Look on the left and right sides of the high/low switch. If you do not see a total of 3 colored wires connected to the side terminals, two black and one red, then the installation is wrong. One side of the switch should have two terminals, both with black wires. The other side should have just one terminal with a red wire on it.
Hopefully that makes sense and helps. If not, post back on here and I'll try to troubleshoot some more. Read Less
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7 answers

Can I use a variable speed control wall switch for this? Or at least a 3-speed switch?

This question is from 24 in. Belt Drive Whole House Fan with Shutter
Asked by
Pittsburgh, PA
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July 28, 2015
I'd like to know if an option for a lower setting for the fan to run on is possible. Thanks! Also, is this the Cool Attic brand fan?
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Answers (7)

Asked by
Northern Kentucky
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Home Improvement Profile: DIYer
October 18, 2016
Answer: 
The fan comes with a 2-speed motor and a 2-speed switch. A 3-speed switch won't work on a 2-speed motor, and a variable-speed switch would be unsafe (as in potentially damaging the fan and/or starting a fire).
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Asked by
Santa Rosa, CA
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September 9, 2015
Answer: 
According to the manufacturer instructions, no variable speed rheostat control is supposed to be used. If it is a two speed fan, you can have a High/Low/Off switch, or a timer switch wired to a High/Low switch. But you're pretty much limited to two set speeds.
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Asked by
BRINIGSVILLE,PA
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August 26, 2015
Answer: 
no it is a 2 speed motor you will burn the motor up if you use speed control switch or 3 speed switch
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Asked by
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August 6, 2015
Answer: 
The brand name listed on Home Depot's site is Heat Stream. I don't know if they are in any way related to Cool Attic.
The way the fan is wired to work, it is set up for just a low and high setting. I know of a way you set it up to just run in high or just run in low mode, but I don't think the motor is set up to be variable. And I don't see a way to run it off a three speed switch.
There are some work
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The brand name listed on Home Depot's site is Heat Stream. I don't know if they are in any way related to Cool Attic.
The way the fan is wired to work, it is set up for just a low and high setting. I know of a way you set it up to just run in high or just run in low mode, but I don't think the motor is set up to be variable. And I don't see a way to run it off a three speed switch.
There are some work arounds you could try but I wouldn't guarantee they would work and would void your warranty.
Read Less
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Asked by
Hammond, In.
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July 30, 2015
Answer: 
I would not use a variable switch. Mine came with a pretty good double set of switches-1 for On/Off,the other for High/Low.THE WIRING IS COMPLICATED-WE HAD A PRO DO IT.
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Asked by
Carson City, NV
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July 30, 2015
Answer: 
Jenna-
Unfortunately the motor that came with your Cool Attic WHF cannot be easily paired with a variable speed switch (the motor itself is only designed to run at two speeds).
However, I was able to slow my fan down (resulting in significantly less noise!) by swapping out the drive pulley on the motor. The pulley that came with your WHF is a 2 3/4 inch Chicago style pulley; I changed mine to a 2 inch Read More
Jenna-
Unfortunately the motor that came with your Cool Attic WHF cannot be easily paired with a variable speed switch (the motor itself is only designed to run at two speeds).
However, I was able to slow my fan down (resulting in significantly less noise!) by swapping out the drive pulley on the motor. The pulley that came with your WHF is a 2 3/4 inch Chicago style pulley; I changed mine to a 2 inch pulley and it has been working great (you may want to use a 2 1/2 or 2 1/4 inch pulley). Note that this will reduce the airflow, but for my needs the 2 inch is working wonderful! I advise you though to not go any smaller than 2 inch, as there will not be enough suction to open the louvers, and a pulley smaller than 2 inch may damage the motor. Overall this is relatively easy and cheap modification (< $10). Hope this helps! Good luck and stay cool! Read Less
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Asked by
Baltimore,Md.
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July 30, 2015
Answer: 
No variable speed switch. Unless you are getting a real expensive variable speed drive unit. The motors that are provided with the units can't handle off the shelf speed controls. You can use the three speed switch but you will only have two speeds. Just insulate the unused led.
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6 answers

Exterior wall mount

This question is from 24 in. Belt Drive Whole House Fan with Shutter
Asked by
dallas, texas
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August 11, 2015
Can this mount on wall and is this rain resistant
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Asked by
Read all my Q&A
August 18, 2015
Answer: 
While technically the unit could be mounted on a wall, it is not designed for such and would probably void any sort of warrant. It is NOT weather resistant. It sounds to me like you are looking for something more like an attic exhaust fan that mounts in the side wall of an attic. Those would be designed for a vertical installation and would be weather resistant.
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Asked by
Carson City, NV
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August 14, 2015
Answer: 
This whole house fan was not designed to be used on an exterior wall, and is not weather resistant. Please select another fan for these purposes.
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Asked by
Plano, Texas
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Home Improvement Profile: DIYer
August 13, 2015
Answer: 
On page three of the instructions... "The fan and shutter are designed for horizontal installation only - the louvers will not function in the vertical position. Decide whether you will use a Joist-In or Joist-Out installation."
No, this fan is not rain resistant.
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Asked by
Hammond, In.
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August 13, 2015
Answer: 
My instructions stated that the fan can be mounted only as intended-horizontally, and in a weatherproof area. This fan is not designed as an exhaust unit for garages,etc. Hope this helps..
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Asked by
Nevada
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Home Improvement Profile: DIYer
August 13, 2015
Answer: 
No, because it is intended for horizontal use it may throw the balance off, and it is not intended to be exposed to the weather. If you prefer a wall mount, then you should consider a gable style vent. Still, a ceiling-mounted whole house fan will provide the greatest amount of circulation, provided you have enough static venting in your attic to handle all that pressure. That just means you have to Read More
No, because it is intended for horizontal use it may throw the balance off, and it is not intended to be exposed to the weather. If you prefer a wall mount, then you should consider a gable style vent. Still, a ceiling-mounted whole house fan will provide the greatest amount of circulation, provided you have enough static venting in your attic to handle all that pressure. That just means you have to allow enough clear venting area to match the performance of the fan, otherwise the fan will be overloaded and wear out pretty quickly. It could even overheat and cause an electrical fire. Read Less
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Asked by
Baltimore,Md.
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Home Improvement Profile: Professional
August 12, 2015
Answer: 
No, the fan is for interior use only.
You would need to get a type with a cover/dome over it.
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6 answers

Can a Master Flow 12-hour timer be used with this 24" whole house fan?

This question is from 24 in. Belt Drive Whole House Fan with Shutter
Asked by
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August 4, 2015
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Asked by
Northern Kentucky
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Home Improvement Profile: DIYer
May 5, 2016
Answer: 
Absolutely yes. I've installed 3 of these fans in my last 3 houses - complete with timers. Just install the timer in line with the hot (black) wire that's coming from the circuit breaker.
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Asked by
Santa Rosa, CA
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September 9, 2015
Answer: 
From my own research, a number of different timer switches can be used, but according to the manufacturer, you are not supposed to use any variable speed rheostat. I know those are two different functions, but it's worth mentioning. I don't know the theory or a lot of detail behind it, but choose a switch that is not only rated for the Amps/Watts of the motor, but also the HP. The Leviton switch I found Read More
From my own research, a number of different timer switches can be used, but according to the manufacturer, you are not supposed to use any variable speed rheostat. I know those are two different functions, but it's worth mentioning. I don't know the theory or a lot of detail behind it, but choose a switch that is not only rated for the Amps/Watts of the motor, but also the HP. The Leviton switch I found was rated up to 1 HP. Many others I saw were only 1/4 HP as opposed to the 1/3 HP rating of the fan motor. Read Less
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Asked by
Plano, Texas
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Home Improvement Profile: DIYer
August 7, 2015
Answer: 
You might want to seek the advice of a licensed electrician, however I will provide the following assistance to help you make a decision. The unit comes with two switches. The ON/OFF switch is a standard 15 AMP SPST switch. The LOW/HIGH speed switch is a standard 3 way switch. Although not directly related to your question, since you are asking about a TIMER and not a speed control device, page one of Read More
You might want to seek the advice of a licensed electrician, however I will provide the following assistance to help you make a decision. The unit comes with two switches. The ON/OFF switch is a standard 15 AMP SPST switch. The LOW/HIGH speed switch is a standard 3 way switch. Although not directly related to your question, since you are asking about a TIMER and not a speed control device, page one of the instructions states, "Do not attempt to use this fan with any speed control device". Finally, the fan was easy to install and works great. I run it on low since that seems to do the job for my house. I've lowered the attic temp 15 degrees and the garage 10 degrees, all during a 105 degree Texas afternoon. Good luck and have fun. Read Less
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Asked by
Carson City, NV
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August 6, 2015
Answer: 
Robert-
As long as you replace only your on/off switch, while still retaining a high/low switch; you should have no problems using a Master Flow 12-hour timer with your WHF.
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Asked by
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August 6, 2015
Answer: 
We wanted a fan with a timer as well (I figured they all had them since I grew up in a house built in the 1960s that had one on a timer) but this particular fan comes only with an on/off and hi/lo switch. I used the Masterflow 12 hour switch in place of the provided "on/off" switch and we have had no issues. There are other similar timer switches out there, but read closely and make sure they are rated Read More
We wanted a fan with a timer as well (I figured they all had them since I grew up in a house built in the 1960s that had one on a timer) but this particular fan comes only with an on/off and hi/lo switch. I used the Masterflow 12 hour switch in place of the provided "on/off" switch and we have had no issues. There are other similar timer switches out there, but read closely and make sure they are rated for the juice that will flow through to the fan. Many are weaker and won't work (or won't last long) on a whole house fan circuit.
If you have basic wiring knowledge, following the instructions provided with the 12 hour timer should be easy for you.
Note, we still used the "hi/low" switch provided with the fan, but you could wire this so it just runs at the high speed and skip using the hi/lo switch. There is really not much difference between the high and low setting, at least not that we can tell.
Read Less
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Asked by
Baltimore,Md.
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August 6, 2015
Answer: 
Any Timer should work as long as it is hooked up correctly. The timer needs to be installed in such a way so it turns on and off the power going to the speed control from the electrical Panel. This way no matter which speed is selected the fan will turn off and on with the timer.
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Customer Reviews

24 in. Belt Drive Whole House Fan with Shutter is rated 3.7 out of 5 by 135.
Rated 5 out of 5 by from Everything a person with normal expectations would want This is not the Rolls Royce of ceiling fans. It is a ceiling fan that draws air through your house at a decibel level which is reasonable for a machine doing this job. My handyman took about 3 hours to install it and he said the directions were easy to follow. I use it almost every day. It does a great job.
Date published: 2016-08-02
Rated 5 out of 5 by from 24 in belt drive whole house fan with shutter This is the second whole house fan I have installed in two different homes. Second install when much faster as I know how to install via the instructions and noting the shutter assemble impacts where you cut the sheet rock hole in ceiling. Install is easier if your house is pre-wired with a 3 gauge wire. Overall fan, motor, assemble is fine, works quietly and I like the two speed fan motor for high and low. Fan moves a lot of air as expected. They are including two switches on/off and high/low in the box. They should include a winter cover to attach to the shutter inside the house to stop any air flow. The shutters do leak cold air in the winter or hot air up during the heating period in the winter.
Date published: 2016-10-11
Rated 4 out of 5 by from We installed this last week. Fairly easy to go in once you have the measurements down and the pro... We installed this last week. Fairly easy to go in once you have the measurements down and the proper hole cut. Since it's November and we live in New England we won't be firing it up for real until next June but the tests we ran had it pulling in a lot of air from windows throughout our 1400 square foot house.
Date published: 2016-11-01
Rated 5 out of 5 by from great way to save on A/C bill These fans are a bit of project to install but worth the trouble in savings. If turned on at night when it is cool out--if it is cool out!--we find the house cools down to about 5 degrees above the outside overnight low. We close all nearby windows and have it draw the cool air through the downstairs. If we need to cool upstairs rooms near the fan we just crack those windows. If you are able to open your basement windows, even better, as that air is cooler. Once the outside temps start to rise in the morning, we turn off the fan and seal up the house for the day--including closing curtains and shades. This system doesn't work when the nights are hot, but there are usually quite a few cool summer nights (below 70) followed by hot days. We estimate that we save several hundred dollars a year with this. Important to remember: CLOSE the attic door or louvers before turning on the house A/C and seal and insulate the opening for the winter or you will lose some of that money saved. This replaces one that came with our 60+ year old house. It is more powerful than the old model, and because of the belt drive, quieter.
Date published: 2016-08-24
Rated 4 out of 5 by from Too hot out to tell... I know its a great idea during times when it is a bit cooler outdoors---just been in the high 90s since installing so need to rely on central AC for now.
Date published: 2016-07-26
Rated 5 out of 5 by from Great Product Well worth the time to install. I wake up and flip fan on, pulls in morning air drop house to 75deg.
Date published: 2016-08-16
Rated 5 out of 5 by from Best addition Easy to install works very well and i would recommend this product
Date published: 2016-10-18
Rated 5 out of 5 by from It works GREAT! A little loud, but great! It works GREAT! A little loud, but great!
Date published: 2016-10-25
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