Hello, All the walls of my basement are below grade and there are no windows. Just a door and stairwell that leads up to daylight. The basement has 8' walls. The only good news is that, unlike most basemetns, this one stays very dry all year round except for July/August where the humidity might spike up to around 60%-65%. The rest of the year it is between 30%-50%. There is no water entering from the walls or floor. Nonetheless, there is a constant musty odor and I'm baffled as to what's causing it. The only explanation I can think of is that the walls are covered with fiberglass insulation wrapped in a poly type of paper similar to Tyvek. Could this be traping water vapor outgassed from the concrete walls? I would like to remove the insulation and install some type of ventilation to control the odor and to mitigate a slight radon problem. Any suggestions? Thanks.

Need cross spectrum uv lamps for Clarion Model PC2520R. Have not been able to find any lamps for my system.