Quick answer
A replacement radon fan costs $200–$600 for the unit alone and $500–$1,100 installed, with labor typically $50–$100 an hour. Most fans last 5–10 years and carry a 5-year warranty, though a correctly sized fan running at low load often exceeds 20 years. The important detail is that a failed fan makes no noise, so the manometer on the pipe — not sound — is what tells you the system is still working. Call (888) 840-6512 to reach a certified water damage restoration company in your area; the line is answered 24/7.
Written & reviewed by Marcus ReedIICRC WRT
Reviewed August 17, 2026· Next review Feb 2027
What a Radon Fan Costs
The fan is the only moving part in a radon mitigation system, which makes it the only part that wears out — and the only part that can fail without you noticing.
The unit alone: $200–$600. Replaced with labor: $500–$1,100. Labor typically runs $50–$100 an hour, and most straightforward swaps take one to two hours because the fan is joined to the existing pipe with rubber couplings and hose clamps.
Radon Fan Replacement Cost Breakdown
| Item | Typical Cost |
|---|---|
| Fan unit (residential, standard static pressure) | $200–$450 |
| Fan unit (high-suction, tight soil) | $350–$600 |
| Labor, accessible exterior or garage mount | $100–$250 |
| Labor, attic or elevated exterior mount | $200–$400 |
| Electrical work if supply needs upgrading | $150–$400 |
| Typical all-in replacement | $500–$1,100 |
The common brands are RadonAway, Festa and Fantech. All three are legitimate; the model matters far more than the badge.
How Long They Last
Most radon fans last 5–10 years, and carry a 5-year manufacturer warranty. A correctly sized fan frequently runs 15–20 years.
The reason for that wide range is duty cycle. A radon fan runs continuously — 8,760 hours a year, with no off season. That is a hard life for a small motor, and how hard depends entirely on whether the fan is working within its rated range.
An undersized fan straining against more static pressure than it was designed for is the usual explanation for one that dies in year four. This is worth knowing at replacement time, because fitting the same undersized model again simply restarts the same clock.
How to Tell It Has Failed
This is the part that matters most, because a failed radon fan is silent. There is no alarm and no smell. Families have gone months with a dead fan and an unmitigated house.
The definitive test is the manometer — the small clear U-shaped tube on the pipe, partly filled with colored liquid:
- Liquid at two different levels → the fan is pulling suction. System working.
- Liquid level on both sides → no suction. Fan has failed, or lost power.
Other signals worth acting on:
- The fan has become noticeably louder, or is humming, grinding or rattling. Bearings usually announce themselves before they stop.
- Vibration you can feel through the pipe or the wall.
- A breaker that trips repeatedly on that circuit.
- Radon retest comes back elevated when it was previously low.
Check the gauge every few months. It takes five seconds and it is the whole maintenance regime.
Sizing: Why the Right Fan Is Not the Biggest Fan
Radon fans are specified by static pressure curve, not horsepower or pipe diameter, and the correct choice depends on what is beneath your foundation:
| Condition | What It Needs |
|---|---|
| Tight clay or low-permeability soil under a slab | High suction, lower airflow |
| Loose gravel or coarse fill | Higher airflow, lower suction |
| Sealed crawl space membrane | High airflow, low suction |
| Long or restrictive pipe run | More static pressure capability |
Fitting whatever is on the van is the most common reason a system runs continuously and still never reaches target levels. It is also why a like-for-like replacement is usually right when the original system tested successfully — and why it is worth a diagnostic conversation when it never did.
A bigger fan is not a better fan. Oversizing pulls more conditioned air out of the house, costs more to run every day for a decade, and can be noisier for no measurable benefit.
Can You Do It Yourself?
Mechanically, yes — couplings and hose clamps, no specialist tooling. Two cautions:
Electrical compliance. The connection has to meet code, and outdoor and attic installations have specific requirements. If the original was hard-wired rather than plugged into a switched outlet, this is not a plug-swap job.
Specification matching. Choose the replacement from the static pressure the system needs, not from the pipe diameter it happens to fit. And retest radon afterwards — the manometer confirms airflow, not results.
Maintenance Beyond the Fan
- Check the manometer quarterly. Free, five seconds, catches silent failure.
- Retest radon every two years, per EPA guidance, regardless of what the gauge shows.
- Retest after any foundation work, after finishing a basement, and after encapsulating a crawl space — sealing changes how soil gas moves and voids the previous result.
- Keep the discharge clear. Check the roofline termination is not obstructed by a nest or debris.
- Do not switch the fan off to save electricity. Levels return to pre-mitigation within hours.
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Frequently Asked Questions
How much does it cost to replace a radon fan?
The fan itself runs $200–$600 depending on the model and static pressure rating, and a full replacement including labor comes to $500–$1,100. Labor is usually $50–$100 an hour and most swaps take one to two hours because the fan is joined to existing pipe with couplings.
Costs go up if the fan sits in an attic or on an exterior wall at height, if the electrical supply needs upgrading, or if the original installer hard-wired it instead of using a switched outlet.
How long does a radon fan last?
Most radon fans last 5–10 years of continuous operation and carry a 5-year manufacturer warranty. Because they run 8,760 hours a year, that is a genuinely hard duty cycle for a small motor.
A fan that has been correctly sized for the system — meaning it is not straining against more static pressure than it was rated for — commonly runs 15 to 20 years. An undersized fan fighting a restrictive pipe run is the usual explanation for one that dies at year four.
How do I know if my radon fan has stopped working?
Check the manometer, the small U-shaped gauge mounted on the pipe. When the fan is running, the liquid sits at two different levels; when it stops, both sides equalise. That is the definitive test.
Other signs are a fan that has become noticeably louder or is vibrating, a humming or grinding noise, or a breaker that trips repeatedly. The dangerous case is the quiet one: a failed fan is silent, so families sometimes go months without noticing. Look at the gauge every few months and retest radon every two years.
Can I replace a radon fan myself?
Mechanically it is a simple job — the fan is joined to the pipe with rubber couplings and hose clamps — but there are two reasons to think carefully. First, the electrical connection has to comply with code, and outdoor and attic locations have specific requirements.
Second, replacing a fan with a different model changes the system's airflow, and the correct replacement is chosen from the static pressure the system needs, not from the diameter of the pipe. If you do it yourself, match the specification and retest radon afterwards to confirm the system still performs.
What size radon fan do I need?
Sizing comes from the foundation and the soil, not the house's square footage. Tight, low-permeability soil beneath a slab needs a high-suction, lower-airflow fan; loose gravel needs the opposite. A sealed crawl space membrane usually needs a high-airflow, lower-suction unit.
This is why fans are specified by static pressure curve rather than horsepower, and why an installer takes diagnostic measurements before choosing one. Fitting whatever is in stock is the most common cause of a system that runs but never reaches target levels.
Who do I call right now for water damage?
Call (888) 840-6512. The line is answered 24 hours a day, seven days a week, and connects you with an IICRC-certified water damage restoration company that serves your area. Describe what you can see — where the water is coming from, how long it has been there, and whether it smells — the more specific you are, the faster the right company is on the line.
If the source is a pipe or an appliance, shut the main water valve first. Have four things ready and the call goes quickly: the address, when the water started, what is wet now, and whether you have filed an insurance claim.
Still not sure which of these is your situation? (888) 840-6512 · toll-free · answered 24/7
Sources
- EPA — A Citizen's Guide to Radon
- EPA — Map of Radon Zones
- EPA — Consumer's Guide to Radon Reduction
- RadonAway — Radon Fan Replacement Guide
Methodology: How we source and verify data · Report an error
Disclaimer: HearthDry is an independent educational resource. This article is for informational purposes only and does not constitute professional, legal, or insurance advice. Consult licensed professionals before making decisions about your property or insurance claims.
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