Allergens are an enemy that people have been fighting for decades. Vacuum cleaners and air conditioners are almost all equipped to leave the air that you breathe in as healthy as it can be.

There is one thing that these aren’t particularly suited to tackle though. That’s radon.

Radon is a radioactive gas that can be released from the soil when certain chemical breakdowns occur. It can seep up out of the ground after forming and enter the air. When outdoors, there is also radon around, but the difference is how fast it dissipates. Your home is closed space, so if ventilation is poor, it may persist in the air.

The big issue with this is how dangerous this gas is. It can increase the chance of a person getting lung cancer: Radon is the second most common cause of this disease in the United States.

The solution to this is radon mitigation, using a radon fan. This is a device that will stop the radon from even entering your home in the first place, by sucking it out from under your home.

Getting a radon fan will make the air in your home healthier than it has ever been and will keep everyone in it safe. Buying one of these isn’t something you do everyday though, so I’m here to help with that.

Without further ado, let’s jump straight into it!

Detailed Reviews of the 5 Best Radon Fans

Most Popular Radon Fan

RadonAway RP145c Radon Fan

A radon fan doesn’t need to be pretty or good-looking. It’s a nice benefit to have but ultimately, it’s all about the functionality. Can it do the job you purchased it for? Which in this case, is draw and vent radon to the outside of your house? Yes, it can, and pretty darn good too.

Before we even get into the specs, the simple fact that this Radon Fan rated at 4.5 stars from over 1,000 reviews says all it needs to about the quality. This is essentially the people’s choice, so you can be confident with it.

This radon fan is built to operate quietly, so you won’t have to hear it hard at work in the middle of the night. And it is energy efficient too, so it’ll save you money on your electricity bill when compared to other models.

This four-inch fan will pump out 166 cubic feet of air every minute, which is a great rate to achieve proper ventilation with. I doubt there’ll be much radon left under your house after that!

This model attaches to a 4.5 inch duct.

Pros Cons
Well-pricedDoes not include power cord
Runs very quietWarranty is not ideal

Our Verdict

A radon fan doesn’t necessarily need to look good. If it’ll be at a part of your house that people might frequently pass, then you’ll likely want to go for one that looks good too. This fits that bill nicely, plus the price tag is wallet friendly.

There are a few common issues that people have with this model though.

It is an extremely quiet fan as pretty much everyone who has bought it will testify. For some people, it begins to get louder and louder as time goes on, until it is unbearably loud.

The answer to that is to take care of that issue with the warranty. This is where the second problem pops up. If you install it yourself, you get only 90 days. If you have a professional do that, then it becomes one year.

This makes it almost essential to have it professionally installed, which is extra money you’ll have to give up. It is important to be aware of this.

Best 4” Radon Fan

Fantech RN2 4-Inch Radon Fan

Bigger isn’t always better when it comes to radon fans. A bigger fan can draw more air, but there’s no point doing that for a smaller home. You’ll only be giving yourself a bigger electrical bill.

This four-inch radon fan from FanTech performs admirably for its size. Even if its 123 CFM isn’t good enough for you, the price should make it acceptable. You’ll be saving money over other models.

It goes for a glossy white design, which makes it a bit easier to wipe it down if it gets dusty or dirty. For me, it’s just a more attractive look than a matte finish.

Whether you need this indoors, outdoors, or even in places that are moist, this Fantech radon fan will get the job done for you. For larger homes with a lot more spaces, you might need something more capable, but this should work fine for most.

It also comes available in different variants so you can pick whichever is best for you.

Pros Cons
InexpensiveBuild quality isn’t the best
Glossy finish is attractive
Comes in different variants

Our Verdict

If a four-inch radon fan will suit your ducts, then going for this Fantech model is one of the better decisions you can make.

It comes in four different variants, ranging from 90 CFM to 285 CFM, so it will fit most people’s needs well. If you also have different duct size requirements, each one has a different size. That makes things easy. This particular variant attaches to a 4.5-inch duct.

It is recommended that you get a professional to put this in place for you. It doesn’t have the best build quality and it will likely require you to rig up a lot of things to get it in place. Once it is all set though, you’ll be good to go.

One good thing, opposed to the RadonAway model above, is that you get a five-year warranty, which will have an extra year added if you register online. That’s even if you install it yourself!

Best 6” Radon Fan

RadonAway SF180 Radon Mitigation Box Fan

The size of your duct can be what stops you from going for a specific radon fan. You can use certain attachments as adapters, but that can be hassle especially if you don’t have much experience. This model can attach to a three or four-inch duct. Yep, either!

Unlike the others so far, this is a box fan, so it has a rectangular design. The exterior is white, and RadonAway says that it will stay white too. We’re all familiar with those whites that eventually turn to yellow, so rest assured that this isn’t one of them.

If you’re going to use this where there might be moisture, that won’t be a problem either. It has condensate management, so it can take care of that.

And of course, this model, like most RadonAway units, is almost silent. Noise and vibration won’t be much of an issue with this box fan, despite the fact it is six inches.

The maximum flow rate with this is 149 CFM, which is a moderate value, but this is an expensive unit. I’d have like a bit more performance out of it, to be honest.

Pros Cons
Six-inch fan is good for larger spacesCostly
Runs very quiet
Can run in moist locations
Compatible with two duct sizes

Our Verdict

It costs a lot, but you get a lot too. Don’t let the modest CFM value fool you.

This is versatile thanks to being able to mount to both three and four-inch ducts. You also don’t need to worry too much about where you’re putting it. It can handle moisture perfectly fine, so whether under your house or outside in the rain, it’ll withstand it.

Radon fans that aren’t built well can also be as much of a nuisance as they are a help. Minimal vibration and sound will make you forget that this one is there.

This is a fantastic choice if you’re willing to spend extra for this. The same warranty situation applies here though. If you install it yourself, you only get 90 days on your warranty as opposed to five if professionally done.

Quietest Radon Fan

Fantech HP 190SLQ Slimline Radon Fan

So, here’s another boxy model. This is from Fantech this time. They put this one into their Slimline series, as that rectangular design allows for a different fan orientation and a slimmer fit.

This is likely as attractive as radon fans get. Sure, you might look at it and think it’s not the most gorgeous thing you’ve seen, but I see some visual appeal there.

If you’re not a fan of the rumbling and vibrating that household machinery can bring, you’ll want something that runs smoothly and quiet. Well, thanks to the Noise Reduction Mounting System on this, you’ll get precisely that.

Installation is incredibly easy too, thanks to the connectors that this comes with. You won’t need to go searching for third-party connectors or anything of the like. That makes installation a much easier process. Plus, it will accept the pipe at the point it exits the wall, so it basically helps obscure it for a cleaner look.

This will pull air at up to 160 CFM, which is alright. It is a relatively expensive unit though, so it is important that you’re prepared for the price tag.

Pros Cons
Runs quietlyA bit expensive
Design is pleasing, and it allows for a cleaner look when you install it
Easy to get set-up
Can withstand moisture

Our Verdict

It is important to get radon out of your basement, but at the same time, you don’t want to have to hear the constant humming and whirring of a high-powered fan. That’s why quiet models like this are available.

What I particularly like is how the low noise isn’t the whole selling point. Apart from the price, it excels in essentially every other category.

I find myself slowly becoming a huge fan (no pun intended) of Fantech products. That warranty is amazing and shows their confidence in their product. You’ll be getting up to six years of cover on this product.

Okay, the price is high, but the value is evident, so you can’t really complain too much.

Best Radon Detector Kit

Airthings 2950 Wave Smart Radon Detector

Getting a radon fan installed costs quite a bit of money. Some houses might not need them as much as others depending on where you live. It is important to keep tabs on what the radon levels are before getting a mitigation system.

That’s not the only time that you’d need a radon detecting kit. After you’ve installed a fan, you’ll still want to keep tabs on the levels. This will let you know whether your fan is working as it should be or not.

A smart radon detector kit like this one will provide that functionality and more.

You want to know your radon levels? It’s got your back. Do you also want to know how much humidity your radon fan will have to put up with? Well, that’s built in too. And it never hurts to throw a thermometer into the mix, does it?

This radon detector runs off batteries. Thanks to the app that it is connected to, you can get real-time monitoring of the sensor levels throughout the day.

This is an easy-to-use and multifunctional radon detector kit. It comes at a price though, as it is more expensive than multiple fans on this list. The ease of use makes it worth it, and I wouldn’t recommend not having one of these before or after installing a radon fan.

Pros Cons
Can monitor multiple levelsVery costly
App allows for easy monitoring
Comes with AA batteries

Our Verdict

I’d never recommend not having a radon detector. If you’re looking at this list now, I hope you have one or are planning to get one. Knowing your levels before installation and after is very important and will let you know how effective your solution is.

This one is a great option. It is expensive, that’s the biggest issue, but with humidity and temperature monitoring in addition to radon, it drives a good bargain. The app it comes with makes monitoring as easy as using any other app on your smartphone.

I might have advocated for a rechargeable battery on any other product, but there’s less downtime when using disposable ones. You don’t want to have to wait to charge when you’re trying to monitor a potentially deadly gas!

You get a warranty of a year on this product and you can access customer support straight from the app.

I hope I’ve been able to convince you as to why I chose this particular radon detector kit!

Do radon fans really work?

The short answer: absolutely.

Like I explained briefly earlier, this gas is produced by radioactive decay in the soil and rocks. That creeps up through the ground, rising like gas does, and if it meets your house in its way, it’ll just waft straight through it. This means it will fill up your home and you might end up breathing it in.

A radon fan simply sucks out the gas under your house and vents it to the outside, before it can even come indoors. Once it is outside, it gets dispersed naturally.

It is a simple mechanism, so it is easy to see how they work, and that they actually do! The United States Environmental Protection Agency agrees that they do!

What CFM do I need in a radon fan?

This is a difficult question to answer with just a few words. This can be a tough question to answer even for people who are professionals. But I’ll try my best to give an easy-to-digest answer.

There’s something known as pressure field extension. This refers to how deep a level you wish to be drawing radon from beneath your house. Determining this involves the use of specialist tools, so it surely isn’t something that you can DIY easily. This is another reason why it can be best to leave this to professionals.

If you don’t want to pay anything extra though, I can give you some advice. The best I can suggest is using a fan that can go up to 166CFM for any house with a foundation smaller than 2500 square feet. However, in many cases you may need to use more than one, so once again, it is very complex.


Radon fans are absolutely essential if you live in an area or a house with very high levels of radon in the air. You shouldn’t joke around with this gas as it is the second biggest cause of lung cancer in the United States.

Radon fans are the easiest and most cost-effective way for any homeowner to get rid of radon in their home. It is important to keep you and your family safe by using these fans.

But which of them is the best, you might be asking? Well, I can certainly tell you which ones I recommend. I’ll give you my top two.

First up, I’d put the Fantech RN2. It might not have the best build quality, but don’t mistake that for meaning that it’s fragile. Just take care when installing it, and you’ll have a dependable, good-looking unit in place. That five-year warranty only makes things better.

After that, I have to point to the RadonAway SF180 box fan. The boxier shape is preferable for many as it can lay flush against a wall. It might be a bit expensive, but you get a fan that doesn’t mind the elements and can also easily be installed to two different duct sizes. That’s a win.

And of course, getting that radon detector kit never hurts!

Well then, that’s what I have to say for now on the topic of radon fans. Don’t play around with your safety and be aware of your radon levels sooner than later.

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