The hum you stopped noticing two winters ago has turned into a rattle, and the little U-tube on the basement pipe doesn’t look the way it used to. If your radon fan is noisy, silent when it shouldn’t be, or just old, you’re facing a small decision with a real consequence: a fan that isn’t moving air means a radon system that isn’t doing anything.
The good news is that this is usually one of the cheaper problems a house can throw at you. Health Canada’s radon reduction guide puts fan replacement at $200 to $300. That’s a 2014 national estimate, not a current Prairie price, and we haven’t found an installer in Winnipeg, Regina or Saskatoon who publishes one. It still tells you roughly what kind of bill you’re looking at.
A quick word on units. Radon is measured in becquerels per cubic metre (Bq/m3). Health Canada’s guideline is 200 Bq/m3, averaged over a year, in the part of the house someone uses four or more hours a day. That’s about 5.4 pCi/L if you’re reading American material.
It’s a guideline, not a law: neither Manitoba nor Saskatchewan requires homeowners to test or to fix anything.
Why bother, then? Health Canada says radon is the number one cause of lung cancer in non-smokers, linked to more than 3,000 lung cancer deaths in Canada each year. That’s the one heavy sentence in this article. Everything after it is maintenance.
If your fan has already stopped, you don’t need to read the rest first. Call (204) 555-0173 or send us a note, and we’ll put you in touch with a C-NRPP certified professional who can look at it.
What a radon fan does, and why it never gets a day off
The standard radon system is sub-slab depressurization, which Health Canada calls almost always the recommended approach when a large reduction is needed. A pipe goes through the basement floor into the gravel or soil underneath, the fan pulls air out from under the slab, and that air is vented outside. Health Canada says a fan mounted indoors is usually vented sideways through the rim joist near ground level, while a fan in a garage or attic is typically vented up above the roof. If you want the full tour of the parts, we’ve covered it in how a radon mitigation system works.
The pipe, the sealed sump lid and the caulked cracks all matter. But the fan is the only moving part, so it’s the part that wears out.
It’s also the part people are tempted to switch off. Don’t. Health Canada’s Radon Reduction Guide for Canadians says the fan “should NEVER be turned off” and has to run continuously for the system to work. A fan that’s been shut off at the breaker because the hum was keeping someone awake is, in practical terms, no system at all.
One related case turns up in newer houses. A radon rough-in was added to the National Building Code in 2010, so many newer Prairie homes have one: commonly a 100 mm pipe under the basement floor, sealed and labelled. Code guidance is plain that the rough-in “does not actively reduce radon levels”. If there’s a capped pipe in your utility room and no fan on it, you don’t have a radon system yet, just the start of one.
How long does a radon fan last?
Health Canada’s answer is “five to ten or more years.” That’s a wide range, and nobody can tell you where your fan will land in it. It runs every hour of every day, so wear is built in. Where the fan sits and how much moisture it deals with make a difference.
Location matters more here than in milder parts of the country. Health Canada warns that a fan and pipe outside the living space, in a garage or attic, “will cool during the colder months of the year, leading to condensation and possibly ice, which can damage the fan.” Its guide adds that condensation problems can be reduced when the fan sits indoors and discharges through a shorter pipe near ground level. On a Prairie January night, that note isn’t academic.
If you don’t know how old your fan is, check the fan housing and any paperwork left by the installer or the previous owner for a date. Ask the installer what their warranty covers and whether the fan is included. One Winnipeg installer advertises a five-year warranty on its systems, but terms differ from company to company, so read your own.
The running cost is modest. Health Canada estimated fan electricity at about $50 to $75 a year, depending on the size of the fan and your energy rates. That’s also a 2014 national figure; we found no current Manitoba Hydro or SaskPower calculation.
No system yet, and no test result? Test first. A long-term test of at least 91 days in the heating season is the number any mitigation professional should design around. Call (204) 555-0173 or send us a note and we’ll point you toward a long-term test. Our radon testing page explains how to run one.
Radon fan noise: what the sound is telling you
A working radon fan makes a steady, low hum and the faint sound of moving air. You get used to it. What’s worth your attention is a change.
| What you notice | What it often means | What usually happens next |
|---|---|---|
| Rattling, grinding or a rising whine | Wear in the fan itself, often the bearings | A certified professional checks it; a worn fan is usually replaced, not repaired (Health Canada’s 2014 national estimate: $200 to $300) |
| A drone you feel through the floor or joists | The fan or pipe is touching framing, or a mount or strap has loosened | Often a mounting fix rather than a new fan |
| Gurgling or dripping in the pipe | Condensation collecting in the pipe or the fan | Check how the pipe is routed; common with fans in cold spaces |
| Whistling or a change in pitch at the outlet in winter | Frost or ice building up at the discharge | Don’t chip at it; call a professional, especially if the manometer has changed |
| Silence | Dead fan, tripped breaker or a switched-off circuit | Check the breaker, then the manometer, then call |
The worst sound a radon fan can make is none. A rattle is annoying. Silence usually means the system has stopped doing its job.
Two things not to do. Don’t fix the noise by turning the fan off, and don’t try to make up for a dead fan by opening basement windows or running a portable fan. Neither is a radon fix, and neither will show up as one on a test.
Check the manometer before you call anyone
Most systems have a U-tube manometer on the pipe: a small clear tube with coloured liquid in it. Health Canada says to check it “from time to time.” A difference in the level between the two sides shows the system is pulling air. If the two sides are level, the system isn’t drawing suction. That could be a dead fan, a tripped circuit, a disconnected pipe, or ice blocking the line.
Look at it now while you’re thinking about it, and snap a photo. That photo becomes your baseline, so next time you’ll know whether it has changed. Don’t adjust or reset the manometer yourself. We’ve written a longer guide to reading a radon manometer.
One limit is worth being clear about. A healthy manometer tells you the fan is pulling. It doesn’t tell you your radon level is below 200 Bq/m3. Only a test does that.
Three Prairie radon fan situations
These are composite examples, not real customers. The details are there so you can recognise your own house.
A noisy radon fan on the side of a Moose Jaw house. The system went in years ago, with the fan mounted outside on the wall. Last winter it started a low grinding sound on cold mornings, and by spring it ran rough all day. The manometer still showed a difference, so the fan was still pulling, just not for much longer.
A certified mitigation professional would likely replace the fan, and there’s no published Moose Jaw price for that job. The only published reference is Health Canada’s 2014 national range of $200 to $300.
It’s also a fair moment to ask whether the fan’s position suits a Prairie winter, given Health Canada’s point about condensation and ice outside the living space.
A 1962 bungalow in St. Vital with a finished basement bedroom. The system was routed up through the attached garage and out above the roofline. During a cold snap the family noticed the manometer had gone level, and the fan sounded different. Condensation freezing in a cold pipe is one likely cause, but it’s a guess until someone looks.
The right move is a call, not a hair dryer and a ladder. Once the fan and pipe are sorted, Health Canada’s advice to inspect the system regularly and retest every five years still applies. If the fan was down for a while, ask the professional whether a fresh test makes sense for that basement bedroom.
A Regina two-storey being bought with a mitigation system already in. The fan is running and the manometer shows a difference, but the seller has no paperwork and nobody knows the fan’s age. The buyers asked for the most recent radon test result and any installer details.
Replacing a fan is a small job next to installing a system, where a Regina installer quotes $2,500 to $3,500. Whether to make it a condition of the offer or a price conversation is a question for your realtor or lawyer, not for us. After you move in, a long-term test in your first heating season tells you where things really stand.
Radon fan replacement, or rethink the whole system?
If the manometer showed suction until recently and your radon test results were good, a straight fan replacement is usually the whole job. A certified professional matches the new fan to your system, reseals the connections, and checks that it’s pulling.
Health Canada’s guide also asks that a system not cause backdrafting of combustion appliances like a furnace, water heater, fireplace or wood stove. It’s reasonable to ask for that check whenever the system is changed. For what a replacement visit involves, see our radon fan replacement page.
Sometimes the fan isn’t the real problem. Rethink the setup when:
- your last test came back over 200 Bq/m3 even though the fan was running (see radon still high after mitigation)
- the fan sits in a garage or attic and keeps icing up or taking on water
- you’ve finished a new part of the basement, or done energy retrofits, since the system went in
In those cases a professional may suggest moving the fan, adding a suction point or sealing more entry points. How much that costs depends entirely on the house.
For whole systems, Winnipeg installers advertise systems from about $1,500 to $3,000; a Regina installer quotes $2,500 to $3,500. No installer in Saskatoon, Brandon, Moose Jaw or Prince Albert publishes a price we could find, so treat those Winnipeg and Regina figures as a rough guide only. Our radon mitigation page covers what goes into a full install.
No province regulates radon professionals. Health Canada recommends a C-NRPP certified mitigation professional, and the Canadian National Radon Proficiency Program has an online directory where you can check anyone’s certification before they touch your system.
Fan dead, noisy, or test result over 200? Get a quote from a certified radon professional. Call (204) 555-0173 or use our contact form, and we’ll put you in touch with a C-NRPP certified professional who covers your area. They’ll look at the system and quote the job; we don’t set the price.
Frequently Asked Questions
How long does a radon fan last?
Health Canada puts the lifespan of a radon fan at five to ten or more years. Where yours lands depends on the fan, where it’s mounted and how much moisture it handles. Fans in cold garages or attics can suffer from condensation and ice in a Prairie winter.
Can I turn my radon fan off at night or in the summer?
No. Health Canada says the fan should never be turned off and must run continuously for the system to work. If the noise is the problem, have a professional look at the mounting or the fan itself.
How much does radon fan replacement cost in Manitoba or Saskatchewan?
No Prairie installer we found publishes a fan replacement price. Health Canada’s 2014 national estimate is $200 to $300. A certified radon professional will quote your actual job after looking at the system.
Do I need to retest after the fan is replaced?
Health Canada recommends inspecting your system regularly and retesting every five years. If the old fan was dead or weak for weeks or months, it’s worth asking the professional whether a new test makes sense. A working manometer shows suction, but only a test tells you the radon level.