RadonAway 23005-1 GP501 Radon Mitigation Fan, 3"

replaced an old 401 unit that was very loud easy to swap in much much much quieter

Radon level is substantially reduced. It has been running for just over a week. I have recommended this already to friends.

Before the fan, I had a radon reading that fluctuated between 2.8 and 4.3. Now with the fan, it's reading between 0.8 and 1.1. I had several challenges given my home size and structure, so this is what I had to do: My house had a passive pipe stacking the middle of the house going up 3 stories to terminate in the attic (so there was a long pipe stretch to suck through and due to finish spaces, several tight pipe turns that I feared would reduce effectiveness). I have a large home with basement footprint about 2000 sqft with 3 main, mostly isolated sections under the slab due to the way the footers are situated (I have the house plans). So I feared at best I would need multiple suction points, or at worst multiple fans, but I started with the single GP501 fan and the passive pipe I already had. I cut the bottom of the pipe and slab, and dug out 10 gallons of sub slab material which is a combo of approximately 2-4 inches of gravel on top of pure clay (before that the pipe just terminated in the ground with no air pocket). I tried to seal some cracks and seams in the basement slab, but since it's partially finished, I could only do that for about half the floor space. I installed the fan in the attic and had my roofer extend the pipe through the roof at close to the highest point of the roof ridge as possible without it being visible from the front of the house. The results are better than I expected! I have two continuous radon detectors in the basement in different locations and one is now reading 0.8 after 14 days pretty consistently, and the other is 1.1. I will say, the fan is not that quiet, and I can hear it in the room where it is above (although it is a low hum that is easy to ignore). I have a tall house, and can even hear it outside a little bit, but just a quiet low hum from the pipe. But I would trade that sound any day for the suction and results this fan provided!

My house is sand and little stone under my basement floor, and my house was built in 1992. I use RadonAway 23030-1 RP145, it can reduce the level of radon to 0.56-4 (American Gas Monitor) in most case, but some days the level will be 6.x. I buy this one, because I want 100% reduce the radon. Actually, GP501 has a high presssure and lowCFW. I use this one about 2 days, the level of radon became to 5.51. After I change to RP145, the level of radon became to 5.51 to 5.43 about 3 hours. I don't why. Gp501 is perfect in sand.

I replaced a discontinued model from the sane maker with identical dimensions. So the installation was super easy for me. It is pretty noisy, but an easy noise to get used to, it is next to a condesor on my house so not a problem for me. If you research the performance and specs there are better values because this on is expensive, and two from this company has lasted only anout 10 years in my experience.