My laundry room is in the center of the house (single story) and vents through the room. Straight up about ten feet, then 45 degree turn then another ten feet and a slight turn as it goes out the roof. The roof cap did have a screen and it did get clogged. I climbed on the house (steep pitch) scary and took the screen off. I have great success with an electric leaf blower. My clothes are dry anywhere from 38 to 45 min's. Perhaps slightly longer for heavy full loads like jeans but not much longer.
