In my home the dryer vent is set up to vent out into an enclosed back porch. The problem is that all sorts of lint (and heat) get pumped out into that enclosed area and makes a mess.
Directly above the dryer there is a ventilation pipe that goes to the roof (also connected to the vent in the bathroom) that I could easily re-route the dryer vent into.
A couple of questions about this:
1) Is it a generally accepted practice to vent a dryer up through the roof, or does a dryer vent have to generally be at a level or downward slope?
2) Is it okay to use the same vent line as the bathroom or am I asking for trouble?
3) Is there a recommend maximum distance for venting a dryer that I am going to exceed going from the first floor of a home to the roof?