How do you vent a 4 inch dryer pipe through the roof?

first you have to calculate the circumfrance of the 4 inch dryer pipe. Then once you have calculated that you must do the answer times by the hole in which is designated in the roof. This answer will then tell you how easily it will actually be to fit the dryer pipe through the roof. if the answer is higher then 10 you must make the hole in the roof larger. Then reed it through and lock it in place. Then you can dry as many things as you like.