Curious as to if any of you can help me with an answer about a Radon test. They used a Sun Nuclear Unit and for some reason the readings spiked, it then settled throughout the entire 2 day test. The average was 7.3 but had spikes of 8.5, 9.5, 10.9. 10.2. The house is vacant and was closed up. The only thing I can think of is that this house has a power driven exhaust fan on the water heater. Could it be possible that as this exhaust fan pulled air out of the house that it also pulled radon gas into the house? These peaks were about every 3 hours which could be every time the water heater refired and the exhaust fan kicked in. The fan does by design run for a fair amount of time. The off peak readings had a lot of 5.1, 4.4, 4.8, 7.1, 5.8 and 6.5 readings. The report says the unit was calibrated in May.
