Just got a 1923-ish house, doing some work on it, and trying to figure out the best way to vent the bathrooms. Neither has any venting at all, and there's no access to the attic space. It's only about 18-24" tall, so I guess it's more of an attic crawl space? Either way, not sure how to go about running any duct short of installing an access hatch and crawling on in.

We have those old spanish-style terracotta attic vents - could I finagle a 4" vent into that from within the house without having to climb up? I'm in LA, and it's a stucco house with a flat roof, so moisture isn't as much of a concern as it ordinarily would be.