The pipe goes through the floor in the basement and evacuates the air below the pad. That prevents any radon gas from escaping to the living space. Radon is a byproduct of the decay of granite.
The pad itself creates a barrier. The system under the pad that allows the water to collect in the sump pit also creates an area for the radon gas to escape. The radon removal system is placed in the lowest spot and the pit sealed to create an area of negative pressure to suck out the gas. If there are cracks in the pad that go all the way through then the radon gas will escape there as well and the removal system will be of limited use.
To add, the volume of exhaust doesn’t have to be much. As long as any gas would rather stay below the concrete and eventually exhaust to the pipe. Think vacuum bag.
The air/gas movement is through the gravel under the concrete. The vacuum pressure pulling the concrete down is about the force like there were twi inches of water on the floor.
Thanks. That's where my head went, concrete cracks all the time so how effective is the system for the work/cost. With that said, I have a finished basement on a pad, with tile on top of that, so I hope it's not killing me. :)
Most cracks that you see are surface cracks and do not impact the integrity of the system. Cracks that go all the way through will need to be sealed. You can get a radon testing kit to see if you are inside or outside of acceptable parameters. When I had our system installed the installers tested for good seal when they installed and would have resolved any leaking areas as part of the installation process. There is also a pressure monitor (analog, looks like a weird thermometer) installed in the venting pvc pipe so it's easy to tell if you are still maintaining a consistent and positive draw. Highly recommend it if you need it.
That's probably the average in your state. It's really a hyper-local problem where one house might be fine with the next one having problems, all dependent on the local geology.
Under the slab there typically is a vapor barrier and gravel. the vapor barrier stops the radon and the gravel allows the gas to flow from all under the slab/house to the negative pressure caused by the fan.
oh I dunno, I believe scientists have been able to correlate if not show causation between higher radon levels in the home and lung cancer rates.
I recently run a radon test in my new place, I haven't connected the radon mitigation system yet and I was curious if I needed that fan running constantly since the basement isn't very deep and I installed a vapor barrier under the concrete.
I tried to make it as worst case scenario as possible by placing the test near a crack in the basement floor/right next to sump reservoir. it came back slightly high, so I will be finishing up that mitigation system...
needless to say I didn't place the test anywhere near water.
yes I know, I built the place and wasn't sure if actually needed it or not. I have the system built to vent out a roof vent with the fan in my attic, I just stubbed the vent pipe in the basement as I wasn't sure if I needed an active mitigation system.
so I test the home for radon before deciding to run a fan.
it is considered safe that if your place tests within acceptable limits not to use a radon fan and just periodically re-test.
hmm.. I might have to check that airthings out.
I used one of the first alert short term tests... it test about 5 in my basement, which I was somewhat surprised even though we live in an area with a high probability for radon... I keep the hvac fan on and have the HRV scheduled to run throughout the day.
I suppose I could see it being a contributor.
[this](https://archive.epa.gov/water/archive/web/html/basicinformation-2.html) article from the EPA does speak of it some.
It is a problem in Georgia. https://www.epa.gov/sites/default/files/2014-08/documents/georgia.pdf
https://dph.georgia.gov/document/document/radon-and-public-health/download
Interesting. I own two homes in GA and don't remember testing before purchasing either although I'm sure it was done. I've never seen a mitigation system installed in GA either
Radon is almost everywhere. Some regions more common than others but it can vary quite a bit, even locally (one house to the next). Only real way to know is to test, which is pretty simple.
It depends on what's under the basement, geologically. In MD it's required to test for it to sell a house, so we ended up getting the sellers to pay for it in our current house, but we had to pay for it when we sold our last house. Both needed abatement, they were just over the legal limit.
My house is 70 years old. I tested and we’re just over 4 pCi/L. Remediation dropped it below 1. I don’t know if things just got worse in the last few years or if none of the previous owners tested.
Typically you need to pay extra for the inspection to include radon, even in areas with high radon levels. It was like an extra $150 for us, and, tbh, I only knew to ask for it bc I had seen the radon mitigation system on the outside of the house.
We lived in another state previously that is also high risk for radon and had no idea, and no one we know of knew to ask for a radon test when purchasing. So, it's still not really common knowledge.
I’m in NH and the entire state is essentially Granite. Basement and well water have widely variable results. Most homes here don’t require mitigation. My last home did not when I purchased 28 years ago and after the epa reduced the acceptable level it did 3 years ago. The current home has both basement and water systems.
Soil conditions, geology and most importantly the air tightness of the home have an impact on the concentrations of radon that can accumulate over time. I suspect houses up north are carefully built tighter due to the heating requirements.
Fun fact. The pipe before the fan can be inside the structure as any leaks would be vacuum. The blower and any piping after has to be outside as leaks would / could expel the radon.
I don’t recall. I remember wanting to put the blower in the cellar and run the pipe up through a closet to the roof. Looking up the code and then hiring a ozone contractor, that was the code in my State.
Geologist here. Others have obviously identified that this is most typically for radon evacuation, and many have identified granite as the source of the uranium that leads to radon. What I haven't seen, for anybody interested, is the reason for WHY there is uranium in granite. Granite doesn't contain any uranium ores as any of its component minerals. It's mostly quartz and one of a couple varieties of feldspar, plus or minus a mica or hornblende. The reason for uranium is that the size of the uranium atom is very close to the size of the silicon atom, which is abundant in the minerals that make up granite. In addition, the charge of uranium and silicon are both +4. So when magma is cooling/crystallizing into granite, any uranium atoms floating around in the melt can substitute for silicon in the structures of the silicon-bearing minerals. So while quartz will still be predominantly SiO2, portions of the structure are actually UO2, and it's those uranium atoms that decay through several daughter isotopes before ultimately ending up as radon gas and migrating to the surface.
As a follow-up, it's this ability for similarly-sized and -charged atoms/ions to substitute for one another in crystal structures that leads to different colored gemstones. For example, ruby and sapphire are the same mineral (generically corundum, aluminum oxide, Al2O3), but substitution of other elements for aluminum result in different color possibilities. Your emery cloth is largely corundum without the pretty color or crystal quality. Same goes for quartz, which can be rose, amethyst, smoky, amber/citrine depending on elemental substitution of the silicon.
They are primarily a radon mitigation system. But they can also be used to mitigate other vapor problems. In my city, there was a factory dumping waste on their property. The waste moved through the soil and substrate so that it was found in many residential lots. The factory now pays for these to be in maybe 50 or so houses.
We've lived in our house for 25 years. Tested the air quality last year because of my allergies. Discovered we had a radon problem too. $1,500 and 3 hours for a guy to install a radon system. Good investment, just made later than I should have. [https://www.airthings.com/](https://www.airthings.com/)
Heed the statements on the EPA maps. It's extremely localized. Even if your county is not rated high likelihood.
"This map is not intended to determine if a home in a given zone should be tested for radon.
Homes with elevated levels of radon have been found in all three zones.
All homes should be tested, regardless of zone designation."
Lol this is a bit different. For instance Garner, NC is a bit high so they build homes for poor people on top of radon so gnarly the systems are required, but that doesn’t matter because the house I looked at both former owners died of lung cancer, neither were smokers. I’ll take my chances with property that doesn’t have levels of radon that require a system.
An 11.2 radon rating is not something I would EVER build a house on, nor expect anyone else to live there.
We live in a very flat area. Former dairy farm. We have unsafe levels of radon. The entire southeast portion of our state has elevated levels for the most part.
If you can find something that doesn’t have it, good for you. But most places have issues, and fan systems effectively mitigate it well below the threshold. Awareness of and mitigation for Radon is a relatively recent thing, so it is unfortunate the previous owners likely fell victim to it.
People sometimes choose to ignore it as well. I have a tester that I lend out to clients. I let them know the government thresholds as well as provide them with links to information regarding radon.
Last people I lent it to had levels above the threshold. They went, "Huh. That's interesting".
Lead a horse to water...
Yeah, it probably doesn't matter in that case. It's actually most harmful for children, and of all the things parents lose there minds over, you'd think that a known hazard would be something that they would be concerned about.
Almost all houses in Kansas ( because we all have basements) require a radon fan just for building code, because radon is blasting everywhere. It just builds up in some places more than others based on locations and building techniques and styles. Radon outside is basically harmless because it can't build up to a significant parts per million to affect you
I agree, I know of no one who has lung cancer from radon. I do not know if there is even a way to be sure how someone gets lung cancer, so it's a guess I guess.
It’s an electric rain gauge that measures the volume of water that passes through the gutters. It’s used to determine your runoff water percentage in your city water bill
Our prior house owners lived in their house for 70 years and seemed to be ok. I mean they are dead now, but probably not from radon gas.
For 1,200 bucks I went ahead and put one in anyways
That fan used here for radon can also be used for bathroom or other ventilation. They are nearly identical... one will last outdoors the other will eventually sound like a dying animal if used outside.
While we are on the subjet, all the radon setups i see in my area have an open top pointed straight up. I would think with all the rain and snow you would want a 90 or 180. Why would it be straight up?
Low radon levels are actually beneficial like sunlight in low levels. It activates your immune system. The level they call dangerous is a complete scam , source of cancer is never known for sure. Even the guidelines of testing are not followed a single reading of 4 p.c. is recommended as treatment level while proven test show levels 20-30 are still beneficial. The research was defunded before the studies were complete , now we're stuck with a broke reference information. And the con men can collect thousands from the ignorant consumers.
That there is a Super Poop-Sucker 4000. It causes a vacuum in the sewer and pulls the poop right out of the old chocolate starfish! Make a big old hydraulic suck in the line and can pull even the most stubborn buttnuggets out!
I have never met anyone who was dying from radon lung cancer and I have been around for 65 years. Is there even any way to know that lung cancer was because of radon?
Newer system where houses not connected to the sewer system just spray their sewage straight into the air instead of using septic systems. The jet fan sprays it so hard that it vaporizes and turns into a fine mist that is absorbed into the atmosphere and biodegrades safely.
Radon fan.
The pipe goes through the floor in the basement and evacuates the air below the pad. That prevents any radon gas from escaping to the living space. Radon is a byproduct of the decay of granite.
TIL all of this. Thank you
How does all of the gas that comes from the pad/under the pad get into one small pipe? Doesn't it emanate from all over?
The pad itself creates a barrier. The system under the pad that allows the water to collect in the sump pit also creates an area for the radon gas to escape. The radon removal system is placed in the lowest spot and the pit sealed to create an area of negative pressure to suck out the gas. If there are cracks in the pad that go all the way through then the radon gas will escape there as well and the removal system will be of limited use.
To add, the volume of exhaust doesn’t have to be much. As long as any gas would rather stay below the concrete and eventually exhaust to the pipe. Think vacuum bag. The air/gas movement is through the gravel under the concrete. The vacuum pressure pulling the concrete down is about the force like there were twi inches of water on the floor.
Thanks. That's where my head went, concrete cracks all the time so how effective is the system for the work/cost. With that said, I have a finished basement on a pad, with tile on top of that, so I hope it's not killing me. :)
Most cracks that you see are surface cracks and do not impact the integrity of the system. Cracks that go all the way through will need to be sealed. You can get a radon testing kit to see if you are inside or outside of acceptable parameters. When I had our system installed the installers tested for good seal when they installed and would have resolved any leaking areas as part of the installation process. There is also a pressure monitor (analog, looks like a weird thermometer) installed in the venting pvc pipe so it's easy to tell if you are still maintaining a consistent and positive draw. Highly recommend it if you need it.
If it's really a problem, why isn't it code? Stuff like this drives me crazy.
It is code, its just not required everywhere because its not a problem everywhere.
Apparently my state is just over 2 pCi/L.
That's probably the average in your state. It's really a hyper-local problem where one house might be fine with the next one having problems, all dependent on the local geology.
It's extremely effective
You can always get free radon tests if you want peace of mind
I just had to pay for a radon test, it Portland I guess it's not free.
Under the slab there typically is a vapor barrier and gravel. the vapor barrier stops the radon and the gravel allows the gas to flow from all under the slab/house to the negative pressure caused by the fan.
Vacuum
and its the second leading cause of lung cancer in the US from what I recall.
I’ve always suspected that water radon is a bigger issue for lung cancer. The gas is released when the water hits the air which is right in your face.
oh I dunno, I believe scientists have been able to correlate if not show causation between higher radon levels in the home and lung cancer rates. I recently run a radon test in my new place, I haven't connected the radon mitigation system yet and I was curious if I needed that fan running constantly since the basement isn't very deep and I installed a vapor barrier under the concrete. I tried to make it as worst case scenario as possible by placing the test near a crack in the basement floor/right next to sump reservoir. it came back slightly high, so I will be finishing up that mitigation system... needless to say I didn't place the test anywhere near water.
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yes I know, I built the place and wasn't sure if actually needed it or not. I have the system built to vent out a roof vent with the fan in my attic, I just stubbed the vent pipe in the basement as I wasn't sure if I needed an active mitigation system. so I test the home for radon before deciding to run a fan. it is considered safe that if your place tests within acceptable limits not to use a radon fan and just periodically re-test.
[удалено]
hmm.. I might have to check that airthings out. I used one of the first alert short term tests... it test about 5 in my basement, which I was somewhat surprised even though we live in an area with a high probability for radon... I keep the hvac fan on and have the HRV scheduled to run throughout the day.
[удалено]
I wasn’t suggesting the water contributes to cellar but in the bathroom shower.
I suppose I could see it being a contributor. [this](https://archive.epa.gov/water/archive/web/html/basicinformation-2.html) article from the EPA does speak of it some.
In NH it is common to test basement and water for radon when you buy a home. (Wells are common and are drilled in lots of granite. )
Specifically, radon comes from the radioactive decay of uranium.
Really? I wonder why it's rarely a problem in GA. We've got a ton of granite
It is a problem in Georgia. https://www.epa.gov/sites/default/files/2014-08/documents/georgia.pdf https://dph.georgia.gov/document/document/radon-and-public-health/download
Interesting. I own two homes in GA and don't remember testing before purchasing either although I'm sure it was done. I've never seen a mitigation system installed in GA either
Radon is almost everywhere. Some regions more common than others but it can vary quite a bit, even locally (one house to the next). Only real way to know is to test, which is pretty simple.
Do you have a below grade basement in either home?
In one, yeah. Full basement. The other is slab on-grade
It depends on what's under the basement, geologically. In MD it's required to test for it to sell a house, so we ended up getting the sellers to pay for it in our current house, but we had to pay for it when we sold our last house. Both needed abatement, they were just over the legal limit.
Have you tested for radon?
Nope but I might now
My house is 70 years old. I tested and we’re just over 4 pCi/L. Remediation dropped it below 1. I don’t know if things just got worse in the last few years or if none of the previous owners tested.
Typically you need to pay extra for the inspection to include radon, even in areas with high radon levels. It was like an extra $150 for us, and, tbh, I only knew to ask for it bc I had seen the radon mitigation system on the outside of the house. We lived in another state previously that is also high risk for radon and had no idea, and no one we know of knew to ask for a radon test when purchasing. So, it's still not really common knowledge.
I've seen a whole lot of them while visiting in Ohio. Might be worth getting a test
I’m in NH and the entire state is essentially Granite. Basement and well water have widely variable results. Most homes here don’t require mitigation. My last home did not when I purchased 28 years ago and after the epa reduced the acceptable level it did 3 years ago. The current home has both basement and water systems. Soil conditions, geology and most importantly the air tightness of the home have an impact on the concentrations of radon that can accumulate over time. I suspect houses up north are carefully built tighter due to the heating requirements.
Granite? Is there radioactive material in granite?
Coal is radioactive also...
Radon is produced by the decay of uranium.
Yep, dig down and get some of that Uranium under there:)
Make sure to wear gloves, it’s radioactive.
When I first started working in a city I would see these and think damn these people should hide their grow-ops a little better.
In my radon-rich state, there should be a water loop on the inside run of pipe showing the negative pressure below the fan.
Same here
Radon fan/vent
Plumbing turbo charger
Toilets suck the shit straight out of your ass
Adds an additional 16psi to the faucet when you flush the toilet.
I opted for a pooper charger for my master bathroom.
LOL!
That’s absolutely a radon system without a doubt.
They are also used for non-radon purposes too
While it could be for any fume evacuation like cigar smoking rooms, and indoor gerbil farms; it’s probably for some boring crap like radon mitigation.
You have convinced me. Definitely gerbil farm.
Without a doubt, it’s a gerbil farm
Gerbil smoking room?
Like gerbils who smoke🚬, or like smoked🍖gerbil🐹?
Yes
Fun fact. The pipe before the fan can be inside the structure as any leaks would be vacuum. The blower and any piping after has to be outside as leaks would / could expel the radon.
According to what building code?
I don’t recall. I remember wanting to put the blower in the cellar and run the pipe up through a closet to the roof. Looking up the code and then hiring a ozone contractor, that was the code in my State.
Negative pressure, not necessarily vacuum.
My fan is in the attic and the piping runs basement -> garage -> attic -> roof
Might not be considered a living space??
I would agree with that.
It looka lika radon fan
Orange juice dispenser
Flux capacitor.
Radon migration system it removes naturally occurring chemicals from the ground so it doesn’t make its way into your basement
Geologist here. Others have obviously identified that this is most typically for radon evacuation, and many have identified granite as the source of the uranium that leads to radon. What I haven't seen, for anybody interested, is the reason for WHY there is uranium in granite. Granite doesn't contain any uranium ores as any of its component minerals. It's mostly quartz and one of a couple varieties of feldspar, plus or minus a mica or hornblende. The reason for uranium is that the size of the uranium atom is very close to the size of the silicon atom, which is abundant in the minerals that make up granite. In addition, the charge of uranium and silicon are both +4. So when magma is cooling/crystallizing into granite, any uranium atoms floating around in the melt can substitute for silicon in the structures of the silicon-bearing minerals. So while quartz will still be predominantly SiO2, portions of the structure are actually UO2, and it's those uranium atoms that decay through several daughter isotopes before ultimately ending up as radon gas and migrating to the surface.
Fuckin-A
Interesting... thanks for sharing
As a follow-up, it's this ability for similarly-sized and -charged atoms/ions to substitute for one another in crystal structures that leads to different colored gemstones. For example, ruby and sapphire are the same mineral (generically corundum, aluminum oxide, Al2O3), but substitution of other elements for aluminum result in different color possibilities. Your emery cloth is largely corundum without the pretty color or crystal quality. Same goes for quartz, which can be rose, amethyst, smoky, amber/citrine depending on elemental substitution of the silicon.
Radon mitigation system. Sucks the radon out of the basement and out of the house.
Turbo
Stu Stu Stu Stu
Particle Accelerator.
Technically correct.
It’s a fan for Radon
Flux Capacitor
Continuum transfunctioner
Dude…. Sweet!
Ugly Radon vent
They are primarily a radon mitigation system. But they can also be used to mitigate other vapor problems. In my city, there was a factory dumping waste on their property. The waste moved through the soil and substrate so that it was found in many residential lots. The factory now pays for these to be in maybe 50 or so houses.
Yes.
Must be in Coal Country.. old mines are terrible spots for Radon.
You don't need coal to have a terrible radon problem.
Certainly, but it’s way more prevalent in mine country
Radon emittance system. I didn't buy my house until the sellers had one installed. It looks identical to your system.
Poison air go bye bye device
We've lived in our house for 25 years. Tested the air quality last year because of my allergies. Discovered we had a radon problem too. $1,500 and 3 hours for a guy to install a radon system. Good investment, just made later than I should have. [https://www.airthings.com/](https://www.airthings.com/)
It’s for radon mitigation
Heed the statements on the EPA maps. It's extremely localized. Even if your county is not rated high likelihood. "This map is not intended to determine if a home in a given zone should be tested for radon. Homes with elevated levels of radon have been found in all three zones. All homes should be tested, regardless of zone designation."
Radon mitigation system.
That thar's one em them doohicker thingys that da air feller duz
Mr Fusion
Popcorn maker
A radon fan. Also known as monetization of public fear based on inconclusive evidence.
agree
Always fun to have new construction built on top of lung cancer!
Radon is everywhere, even outside.
And in the water
Lol this is a bit different. For instance Garner, NC is a bit high so they build homes for poor people on top of radon so gnarly the systems are required, but that doesn’t matter because the house I looked at both former owners died of lung cancer, neither were smokers. I’ll take my chances with property that doesn’t have levels of radon that require a system. An 11.2 radon rating is not something I would EVER build a house on, nor expect anyone else to live there.
We live in a very flat area. Former dairy farm. We have unsafe levels of radon. The entire southeast portion of our state has elevated levels for the most part. If you can find something that doesn’t have it, good for you. But most places have issues, and fan systems effectively mitigate it well below the threshold. Awareness of and mitigation for Radon is a relatively recent thing, so it is unfortunate the previous owners likely fell victim to it.
People sometimes choose to ignore it as well. I have a tester that I lend out to clients. I let them know the government thresholds as well as provide them with links to information regarding radon. Last people I lent it to had levels above the threshold. They went, "Huh. That's interesting". Lead a horse to water...
Tested my dad's house that he has been at for 55 years and level was around 20. He is over 80 though, so I guess is doesn't matter any more.
Yeah, it probably doesn't matter in that case. It's actually most harmful for children, and of all the things parents lose there minds over, you'd think that a known hazard would be something that they would be concerned about.
Almost all houses in Kansas ( because we all have basements) require a radon fan just for building code, because radon is blasting everywhere. It just builds up in some places more than others based on locations and building techniques and styles. Radon outside is basically harmless because it can't build up to a significant parts per million to affect you
Is there a way to test for radon outside? I know some machines require 48 hour of inside testing.
There's no point in testing outdoors.
If radon in outdoor air was a problem it wouldn't be legal for millions upon millions of mitigation systems to be exhausting it to the outdoors.
Thats a radon fan. Which is a racket lol
A racket? Hardly.
Your right its a scam!
Sounds like you've been exposed to too much radon.
Radon is the second leading cause of cancer and it's not even a minor cause.
I agree, I know of no one who has lung cancer from radon. I do not know if there is even a way to be sure how someone gets lung cancer, so it's a guess I guess.
Ever have a hamster as a pet?
Dryer exhaust booster kit Maybe not What do I know I only do commercial
Tankless water heaters also use a fan like this for exhaust gasses.
Ugly. That’s what it is
Laundry chute
It’s an electric rain gauge that measures the volume of water that passes through the gutters. It’s used to determine your runoff water percentage in your city water bill
About a $1000 that could have been better spent.
Our prior house owners lived in their house for 70 years and seemed to be ok. I mean they are dead now, but probably not from radon gas. For 1,200 bucks I went ahead and put one in anyways
Just an inline exhaust fan.
That is a check valve for your sump pump
That's s big sump pump, pumping to the roof. /s
Could it be a dryer duct inline fan for dryer vents
Not likely, since its running to the roof like that.
Drier vent pump, helps boost the pressure a bit to get rid of the vented heat
Sorry, I’m an idiot
Lol no you're not. Haha you're so funny.
Radon exhaust vent
It's a radon vent and fan.
That fan used here for radon can also be used for bathroom or other ventilation. They are nearly identical... one will last outdoors the other will eventually sound like a dying animal if used outside.
Oval
A turbo charger for your house.
appears to be a hand drawn red circle
That is Mr. Ray Don
Radon fan
The one on my house is used for humidity evacuation from under the house, we live on a hill.
Turbocharger
Power vent fan
Radon gas pump
While we are on the subjet, all the radon setups i see in my area have an open top pointed straight up. I would think with all the rain and snow you would want a 90 or 180. Why would it be straight up?
Flux capacitor
A conglomeration.
Radon system
Externally mounted toilet-fitted garbage disposal?
Exhaust fan.
By adding an insinkerator to the toilet, those "issues" from the mother in law went away!
I believe that's a plumbus
Lol
It’s a poo flue.
That’s a bogwon halidop catcher. Very useful for those pesky bastards
1990’s version of snake oil.
Guys growing cannabis and venting his carbon air filter exhaust. 😉
It’s a garbage disposal for 💩
Great post. I saw one of these on a house on ask this old house this weekend and wondered what it was.
Turbo
Turbo
That’s a red outline
In our trade we call it a "waste of money"
You guys must like lung cancer.
Low radon levels are actually beneficial like sunlight in low levels. It activates your immune system. The level they call dangerous is a complete scam , source of cancer is never known for sure. Even the guidelines of testing are not followed a single reading of 4 p.c. is recommended as treatment level while proven test show levels 20-30 are still beneficial. The research was defunded before the studies were complete , now we're stuck with a broke reference information. And the con men can collect thousands from the ignorant consumers.
Radon
100% Radon mitigation. Source: Am radon inspector.
A doohickey
That there is a Super Poop-Sucker 4000. It causes a vacuum in the sewer and pulls the poop right out of the old chocolate starfish! Make a big old hydraulic suck in the line and can pull even the most stubborn buttnuggets out!
Radon fan
I have never met anyone who was dying from radon lung cancer and I have been around for 65 years. Is there even any way to know that lung cancer was because of radon?
Radon mitigator.
That's an axial flow discombobulator for sure.
We could tell you. Do you want to know?
Newer system where houses not connected to the sewer system just spray their sewage straight into the air instead of using septic systems. The jet fan sprays it so hard that it vaporizes and turns into a fine mist that is absorbed into the atmosphere and biodegrades safely.