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I think it was less than a week from the time that I called
He told me about the small amount of whooshing noise the system would make. That sounded fine.
His plan was to install the system in the middle of one of the sides of my basement, near the water heater.
The installer arrived a few days later, on time, and got to work. Even though I was working in the room above the installation, it was quiet and unobtrusive.
When he was done, the system transmitted a lot of low-frequency vibration through the wall. He suggested I see how it sounded the next day, since he would be by to collect the radon meter.
Over the next day I watched the radon level drop to 0.3pC/l so I was very pleased with the performance of the system.
The problem with the noise is that the fan was attached directly to the middle of an outside wall of a bedroom. Now no one is using that bedroom currently but I would not subject anyone to that low vibration in the spare bedroom. The installer made some changes that helped reduce the vibration a little, but now a month later it's still pretty loud and I would be unable to sleep in that room.
He said there wasn't really much they could do besides not put the fan on the wall of a bedroom, but they were already done. I wish the estimator had considered that! I realize that to locate it elsewhere would likely have taken more money and unsightly PVC tubing running in weird places. He said that for more money they could bury a fence post in concrete and attach the fan to that.
I am not complaining about this. If I can't stand the noise any more I will call them and ask/pay them to take further actions to resolve it. I just want to warn people to think about where they are locating the fan, because that issue never came up until they were done installing it. The estimator made no mention of the fan making the low vibrations, just the sound of the air flowing through the tube, which is minimal.
Overall I am happy with the cost and effectiveness of their installation. I am happy I can use my basement without worrying about "
Since we wanted the lowest levels possible we went over, in detail, the possiblity of even further reduction of the radon. The Cascade employees were very patient and informative and gave us a very clear understanding about what they felt could be accomplished.
On the second visit they put in a different fan and only charged us for the time and labor. The radon dropped even further. Cascade advised us about setting up a test monitor, which we have done. We will follow up with Cascade once the test is ended and we get the results.
We feel confident that the Cascade mitigation work has gotten the radon levels in our house as low as they can go.
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