Here's another approach. I don't like the dryer hose "trap" that's created by this configuration. Chances of cleaning it out on a regular basis is questionable (no offense) and it is a potential "lint collector fire hazard " let alone putting more stress on the dryer if it gets clogged. Why not run the hose directly into the closet and along the wall to the outside. Build an insulated cover over the hose to cut down on noise and to conceal it. It won't take up hardly any usable space in the closet, will be hidden, and you'll have a direct line to the outside. Connections can be tight and you don't have to work in the crawl space!