Please excuse me if I'm missing the boat entirely but, as I understand it you are going to buy and install an HRV to deal with the radon instead of doing it the conventional way?
I think now is the time we assemble a cost analysis of both options. IMO there is no way that ventilating the air above the sumps will provide less radon in the house or less energy used compared to regular methods.
Although HRV's are pretty cool.
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