exhaust fan flat roof cap
i am installing exhaust fan in our bathroom. i need to vent through the flat roof directly above. i cant go through the side wall. i am trying to source some sort of end pipe with cap that will go on the roof. it needs to be either 4" or 6" diam and at least 2 feet tall, as we get a lot of snow. i do not want to get into building curb on the roof to raise short vent caps that are available. does anyone know of something that would work?