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Quietcool

QuietCool AFG SLR-40 Solar Attic Fan for Gable Vents - 40 Watt Adjustable Panel - Included AC/DC Inverter for 24/7 Runtime - Thermostat Controlled

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Availability: In Stock.
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Arrives Saturday, Sep 26
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Style: Gable Mount


Features

  • Ultra-energy efficient DC motor
  • Preset thermostat (on at 88oF)
  • Included AC/DC Inverter for 24/7 runtime
  • Adjustable mounting tabs
  • 20 foot power cord and 30 foot solar panel cord included for easy installation

Description

Day & Night Operation - Each QuietCool Solar Attic Fan comes with an AC/DC Inverter that allows your Solar Attic Fan to transition from solar power to electric power as soon as the sun goes down. Lower Attic Temperature 30-50ºF - Our Solar Roof Mount Attic Fan is the most intelligent attic fan on the market today. This fan utilizes solar power to keep your home cool & safe throughout the day. Featuring an industry-leading design, including a vortex air funnel that distributes large quantities of air evenly throughout the roof mount housing, resulting in higher airflow and efficiency. Cool your attic by up to 30-50ºF and within 10ºF of outside temperature when properly sized. Save up to 30% on A/C usage and even more on preventative care that protects your attic, home, and A/C from costly damages. QuietCool smart attic fans are easy to install for the skilled do-it-yourselfer and licensed contractor alike. Ultra-Energy Efficient DC Motors are a revolutionary benefit that lets our fans push up to 10x more air while using less energy. Solar Gable Attic Fans are ideal for any homeowner who wants attic cooling but does not want to use any more electricity. Up to 10x more efficient, moving up to 2x more air than comparable attic fans. Efficiently cools and ventilates the attic by up to 30-50 ºF It helps lower humidity & temperature, inhibiting mold growth and minimizing thermal stress on roofing materials, thus extending the roof's lifespan. QuietCool attic fan helps expel hot air, lowers attic temperature , reduces cooling costs, and prevents moisture buildup and mold. AFG SLR-40 AFR SLR-40 SLR-CRB-2424 AFR SMT PRO-2.0 AFR SMT ES-2.0 AFR SMT PRO-1.3 1. Install your attic fan according to supplied instructions and plug it in. 2. Set the thermostat or use your smart control app to operate the fan. 3. Wait 24 hours & your attic will be cooled and maintained to within 10ºF of outside temperature. The key difference between a smart attic fan and a solar attic fan is the ability to easily control the fan's operation from the convenience of your smartphone. Adjusting the fan's speed, turning it on or off, and monitoring the temperature and humidity levels in your attic is a breeze with the custom seasonal presets available. The best system combines an attic fan and an Advanced Whole House Fan to cool, ventilate, and exhaust the entire home, day and night, and year-round.

Brand: Quietcool


Material: Steel


Product Dimensions: 22"L x 22"W x 11"H


Item Weight: 20 pounds


Included Components: QuietCool Solar Attic Fan, Solar Panel, Mounting Hardware, Owner's Guide


Maximum Power: 40 watts


Special Features: Programmable


Connector Type: Ac Dc


Item Dimensions L x W x H: 22"L x 22"W x 11"H


Item Weight: 20 pounds


Material Type: Steel


Brand Name: Quietcool


Included Components: QuietCool Solar Attic Fan, Solar Panel, Mounting Hardware, Owner's Guide


Model Number: AFG SLR-40


Number of Items: 1


UPC: 811658021985


Global Trade Identification Number: 85


Manufacturer Warranty Description: 15 Year Panel Warranty, 15 Year Warranty, 5 Year Motor Warranty


Item Type Name: Attic Fan


Manufacturer: QC Manufacturing, Inc.


Manufacturer Part Number: AFG SLR-40


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Sep 26

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • Huge Difference in Attic Temperature
Style: Gable Mount
This solar attic fan works extremely well. After installing it, the attic temperature dropped noticeably, which helped keep the house cooler. The adjustable solar panel is a great feature, and installation was straightforward. Very happy with this purchase!
Reviewed in the United States on December 27, 2025 by William Drake
    • Very efficient. Best with 2 sources of power
Style: Gable Mount
Very efficient. Definitely has lowered attic temps. This works with automatic temperature control, but since the thermostat is somewhere inside the fan, if the direction of an outside breeze is toward the fan, it might get up to 90 or 95 degrees F inside the attic before it turns on. Usually it's better than that and might turn on around 75 F or so. It really does seem to work better if you power it from both solar as well as a 120 volt outlet in the attic so it runs longer. I added more soffit vents to help it do its thing. I now have about 7 sq.ft. of soffit vents, which works ok. I did cut some white "plastic cardboard" to custom block air holes around the vent where it's mounted. ... show more
Reviewed in the United States on June 28, 2025 by J. Bathke
    • Built Right
Style: Gable Mount
Can’t find a complaint, all over great build and quality in every little detail. Powerful and even low light cloud cover it pulls a good breeze on solar alone. Very quiet too. I always take apart all things with electric motors wjen brand new and I was so impressed with the motors build it’s akin to old 1950, German build quality and solid with excellent precision roller bearings that I oiled with my custom oil I mix with pencil graphite that makes motors run for generations to come without fail of bushings or bearings. Growing up I saw that companies began to give us things with electric motors without oiling them when Built for planed obsolescence to make things not last much more than it’s warranty limits and this the way it’s built can run a lifetime but with my oil o know it will run as long as it’s not burnt in a fire lol. I’ve not been this impressed with anything made these days until I came across this little green gem. I’m trying to come up with all kinds of ideas to get more of these and use them for travel and outdoor things and even porch fans that time all the time when it’s hot and not worry about it running when I’m not out there with it wasting electricity. I siliconed everything like the solar panel to keep it clean from dust and pollens for years to come to stay perfectly clean whenever it rains and the outside cable wire also to protect it more from the sun and weather deterioration to get more life out of it also. The wire casing material Ms are awesome also to last as long as possible too. I appreciate this company and the care to details and quality they put into this great fan and hope the rest of the world’s manufacturers learn to be the same so people praise them for their products such as this I do here. Like it used to be in our world long ago when there was good pride in all things and they were built to hand down and not just to make the garbage dumps so overloaded with trash. Thanks Quiet Cool and team… ... show more
Reviewed in the United States on July 5, 2024 by Scooby Snacks
    • Working as well as expected
Style: Gable Mount
So I’ve given this fan an impossible task. I have a single story house in Florida with a full southern exposure. The fan is installed at one end of the house. Let’s just say that the fan falls behind in the summer. I only have it running on AC power right now. I have home solar and it’s on an inverter circuit. The power usage is pretty low so I do t feel like I need to add the dedicated solar panel yet. Anyway it moves air very well and was easy for me to install. It responds as it should to temperature and humidity and runs very quietly. I’m going to get another one for the other end of my house. ... show more
Reviewed in the United States on June 5, 2025 by Al G
    • Great customer service!
Style: Gable Mount
This is a great attic fan! It is solar, and can plug into house power. It moves a lot of air, and pulls a lot of hot air out of my attic. I had a minor issue, contacted the company, and they were very responsive. They resolved my issue immediately! I would absolutely buy from them again!
Reviewed in the United States on July 13, 2026 by David L.
    • Trying to save some money
Style: Gable Mount
Review Image by Paulzilla
Review Image by Paulzilla
Review Image by Paulzilla
There was a plugin attic fan in my house when we bought it. It didn’t work. Decided to get this one because of the solar panel and the plug for night time use. It gets very hot here in Fresno California in the summer, so any help keeping the house cool is welcomed. I was able to mount it to the existing vent that was already there. The plug was long enough to reach the previous electric plug. The solar cord I ran through the house right above were the fan was to be. I had to use a drill bit to make the hole in the middle of the mount wider so that the cord would fit through. I gooped tha baJesus out of it so that it wouldn’t leak. It kicked on and I’m happy. Only complaint is that I was only able to mount three of the four brackets. The adjustment screws both stripped on one side. I was in the attic sweating like a pig and it wasn’t wobbling or anything. This one costs a little more than the others, but it’s a brand I’ve actually heard of, it’s got 15 year warranty, and I can get a rebate on 21-26% of the price on my taxes next year. ... show more
Reviewed in the United States on April 27, 2022 by Paulzilla
    • Does Not Cool Attic & Zero Support
Style: Gable Mount
Review Image by TA
I've had this fan installed for a few weeks, but I've had a temperature sensor in my attic for months to monitor the typical temperatures up there. After installing the fan & the advised amount of intake venting, the attic remains up to 50 degrees hotter than the outside temperature. The temperature have not improved at all. In my case, I'm using 3 square foot of intake venting which is right in the middle of what Quiet Cool recommends. Everything else is installed exactly as their instructions advise as well. I've verified that the fan is running all day long. I've verified there are no obstructions causing inefficient air flow. I've tried unplugging the solar panel and just running the fan on AC power. I've tried removing the grille on the font of my exhaust vent. The list goes on an on. The attached picture shows the attic temperature & outside temperature data for 3 fairly cool and cloudy days in early August (2023) in Colorado. On hotter/sunnier days the attic has gotten up to 157 degrees while only being 93 degrees outside and the fan will be running all day long. I contacted Quiet Cool support shortly after installing the fan and realizing that it wasn't working to cool the attic. They did respond and have asked a lot of different questions about my configuration, but have not provided any recommendations as to what needs to change for this fan to work. Communicating with them has been particularly frustrating because they will ask a question and then just not respond for multiple dats. My last communication to them was essentially begging them for some recommendation to get this fan working and that has gone unanswered for nearly a week. Maybe there's something about my install that isn't allowing the fan to work properly or maybe the fan just doesn't do what it's advertised to do. If Quiet Cool support was interested in providing some guidance, I would say that the former might be true, but as of right now I think its the latter. ... show more
Reviewed in the United States on August 8, 2023 by TA
    • Definately blows and is super quiet
Style: Gable Mount
Wouldn't recommend installing this on a 90+ degree day like I did (lost 5 lbs in sweat), but it wasn't difficult. I cut plywood to fill the entire gable and then a hole to the diameter of the fan. Up and down ladders, entire process too about two hours. I also had to extend a 1120V circuit to add a box with an outlet for the AC power. Plugged it in and it ran perfectly. Installed the solar panel and was able to run the cord under the roof cap, so it's nice and clean. Once I plugged the solar power to the fan, it jumped in RPM significantly. It is definitely moving a LOT of air from the attic. I have just purchased remote thermometers that I can track via smart phone to see how the fan may be effecting overall temp and/or humidity. ... show more
Reviewed in the United States on August 10, 2020 by USERBOSCO

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