I live in a leaky 2300 sf 1 story ranch in the NE. It leaks a 'houseful' of air to the outside roughly once every hour.
The main crawl space is 1900 sf and 5 ft high. 6 mil black plastic lines the dirt floor and runs up the side walls 4 ft. There is an active sump pump during winter and spring. In this space sits two gas boilers and 1 gas hot water tank. I have closed all fresh air vents except two. At this time, I can not close off all vents because I need the air for these combustion appliances. However, I run a dehumidifier during the summer anyway, even though it runs 24/7. For the most part, its fairly dry down there, 55 % humidity. With all this said, it smells like a dirt basement/crawl space.
In one open vent I placed a Tjernlund two-fan exhaust fan. From the outside of the house, you can smell the offensive odder big time.
In the crawl space, I have a chimney with three flues. One of the flues is a clear shot from the crawl space to the top of the roof. For example, I can see daylight from within the crawl space. If my house experience 'stack effect', I wish all that moist air would go up this chimney flue and not into the main house.
Q: Is it a good idea to put in a mega exhaust fan that blows smelly crawl space air up the chimney flue? I would assume this would draw conditioned air from the first floor down into the crawlspace. I might lose energy, but my goal is to mitigate the smell. My house is leaky, would this bring in a constant flow of fresh air from the out side. If so, great! Right? Is this a good idea or bad? Any why?