update. i worked on it a little more tonight. instead of putting the blower through the whole, im going to take the 2 feet piece of flue i cut out of it and make a hole for it and just push it in and jb weld it to the flue still inside. then ill form the blower vent to the pipe and put a screw in on top. that way its easier to change out. hard part is making a hole in the flue already in the tank without cutting out the sides.