Quick Answer
For most DIY sub-slab systems, the Festa AMG Maverick (~$147, 4" / 260 CFM) is the best value—quiet, energy-efficient, and durable. If you want everything in one box, the MIDCVFRUN installation kit adds couplers and a pressure indicator. For larger 6" systems, step up to the Fantech Rn3.
New to this? Read the radon mitigation cost guide first to decide whether DIY or a professional install makes sense for your home.
DIY or hire a pro?
A basic sub-slab depressurization system is within reach of a confident DIYer: you core a hole through the slab, run sealed PVC pipe up and out above the roofline, mount the fan in a non-living space, and wire it in. Doing it yourself can cut a $800–$2,500 professional job down to $300–$600 in parts.
Call a certified professional instead if your home has multiple foundation types, a crawl space, very high radon readings, or if you're unsure where the suction point should go or how to size the fan. A poorly designed system can be ineffective—and radon is a health risk, so it's worth getting right. Either way, always confirm the result with a post-install radon test.
How to choose a radon fan
Duct size (3", 4" or 6")
Match the fan to your pipe diameter. Most residential systems use 3" or 4" pipe; 6" fans are for high-airflow systems. The picks below are 4" (Festa, MIDCVFRUN) and 6" (Fantech).
Airflow (CFM) vs. suction
Loose, gravelly soil needs more airflow; tight, low-permeability soil needs more suction (static pressure). If you don't know your sub-slab conditions, have the system pressure-tested rather than guessing.
Outdoor rating & sealing
Fans are rated for continuous outdoor use and should be sealed at every joint. A sealed, weather-rated housing (like Festa's poly-resin body) lasts longer against the elements.
Noise
A good radon fan hums like a quiet refrigerator. Mounting location matters more than the model—in an attic or outside, you won't hear it.
Quick Comparison
| Fan | Duct / CFM | Price | Best For |
|---|---|---|---|
| Festa AMG Maverick | 4" / 260 | ~$147 | Best value overall |
| MIDCVFRUN Kit | 4" / 260-188 | ~$169 | All-in-one DIY starter |
| Fantech Rn3 | 6" / 285 | ~$233 | Larger / high-flow systems |
| RadonAway RP145 | 4.5" / high | Check price | Trusted contractor classic |
The Picks
1. Festa AMG Maverick — Best Value Overall
4" inline, 260 CFM · 4.5★ from 456 Amazon reviews
~$147
Buy on AmazonThe Maverick hits the sweet spot for a typical 4" DIY sub-slab system: quiet, energy-efficient, and built with a sturdy glass-reinforced poly-resin housing that stands up to outdoor mounting. At around $147 it's the best value here, and its 260 CFM suits most homes. Our default recommendation unless your system specifically needs 6" ducting.
2. MIDCVFRUN Installation Kit — Best All-in-One for DIY
4" 2-speed (260/188 CFM), includes couplers + pressure gauge · 4.4★ (140)
~$169
Buy on AmazonIf this is your first radon install, the kit saves a parts-list headache: it bundles the fan with rubber couplers (4"×3") and an air-pressure indicator so you can confirm the system is pulling suction. The two-speed motor lets you dial in airflow for your soil conditions. A little pricier than the bare Festa, but you get the connectors and the gauge in the box.
3. Fantech Rn3 — Best for Larger / 6" Systems
6" duct, 285 CFM · 4.6★ from 544 Amazon reviews
~$233
Buy on AmazonFantech is a long-standing name in radon mitigation, and the Rn3 is its 6" workhorse—the highest-rated fan on this list. Choose it when your system uses 6" ducting or needs to move more air (larger footprints, higher-flow sub-slab conditions). Confirm your system pressure and ducting before buying, since a 6" fan is overkill on a small 3"/4" system.
4. RadonAway RP145 — Trusted Contractor Classic
4.5" inline, the industry-standard radon fan
The RP145 is the fan most professionals reach for—a proven, widely-used model that's a safe default if you want the exact unit many certified installers use. If brand track record matters most to you, it's the reassuring pick; otherwise the Festa AMG offers similar performance for less.
After you install: confirm it worked
Installing the fan is only half the job—the EPA recommends a post-install radon test, and a continuous monitor lets you watch levels 24/7 and catch a fan failure early. Our top pick for verification is the RadonEye RD200 (~$175).
Frequently Asked Questions
Can I install a radon fan myself?
Yes, a confident DIYer can install a basic sub-slab system—core the slab, run sealed PVC up and out above the roofline, and wire the fan. Plan a day of work and check codes; wiring may need a permit or electrician. For crawl spaces, multiple foundations, or very high readings, hire a certified pro.
What size radon fan do I need?
It depends on sub-slab conditions: tight soil needs more suction, loose gravel needs more airflow. A 4" ~260 CFM fan (Festa AMG) fits most homes; a 6" fan (Fantech Rn3) is for larger/high-flow systems. When unsure, have the system pressure-tested and sized.
Where should a radon fan be installed?
Never inside or below a living space. Mount it in a non-livable area—attic, garage, or exterior—vertically and above the highest suction point, so any leak vents outside. The exhaust must discharge above the roofline, away from windows.
How much does a radon fan cost?
The fan runs about $130–$250. A full DIY system is roughly $300–$600 in parts vs. $800–$2,500 for a professional install—the difference is your time and design risk.
How long do radon fans last?
About 5–10 years or more of continuous running. A manometer on the pipe—or a continuous monitor—tells you immediately if the fan fails, since pressure drops and radon climbs back.
RadonAway vs Fantech vs Festa: which is best?
All are reputable. RadonAway and Fantech are contractor standards; the Festa AMG Maverick is a strong-value option. The right pick is less about brand than matching duct size and airflow to your system—get those right and any will perform well.