It's also a bad idea to use an existing roof vent for bathroom exhaust. You'll partially block the vent with the duct pipe, ...

I am reroofing the house and have a question about roof venting. Most houses in the neighborhood have ridge vents on all their ridges. Some have electric vent fans, and one house has a fan powered ...

Less ductwork and holes in the roof for hood vents with an inline system ... which can be problematic in a home with lots of ...