Quadra Fire Stove - outside and inside air

[JRHill]

We've used the stove for many years and I built an adapter to pull outside air through the foundation, crawl space, floor and into the stove. Its the same 4" sized stuff that clothes driers use. It works great. But there is something I'm pondering: during the winter when the crawl space vents are closed the Radon spikes (from tests in the past). I thought of putting a diverter valve in line so when its not too cold out I can pull from the crawl space to create a type of forced turnover of the air in the crawl space. 

Since we live in the PNW it gets fairly humid. I might end up pulling air into the house that's much more humid than the outside. But moist, fresh air is preferable to drier, stale inside air. And it matters not too much cause we end up cracking open the windows when it gets too hot anyway...

Can anyone think of any down sides to this idea of drawing through the crawl space?

Best,
JRH