Hey,venting a new bathroom exhaust fan in the crawl space.or should it be through the roof? thanks in advance for feedback

I wouldn't vent it directly into crawl space. I would either take it out a sidewall(possibly in a joist in crawl space) or out through the roof. Which ever is easiest. But get it outside one way or another. Good luck and I hope this helps.

I agree I would deffently get it to the outside some way