Just finished reading the thread about bathroom fan exhaust options and you had included pics of your recent NuTone installation. Can you tell me from what supplier you obtained the black insulation for the duct? Is that wrapped around a rigid duct and not the flexible duct? I am about to re route ny bathroom fan through the roof from it's current location in the soffit. I have no vertical wall to go through. I want a good roof top vent as well as quality insulation to go around the duct. I have only seen insulation wrapped around a flexible duct.
I live in Wisconsin and hopefully your supplier in Canada can ship to my state.