Will the (gas) dryer provide ventilation for the 5x6 room by blowing air to the outside and drawing fresh air in under the door? I will be using a front-loading washer, so steam from around a top loader lid won't be an issue. It seems like the room should stay fairly dry unless I string a clothes line in there.
Also, I would like to tee off the 3/4" black gas pipe in the crawlspace below. Is it kosher to install a tee with a union as long as the crawlspace is well vented and everything is accessible (after a short belly crawl)? If so, what kind of union should I get?