One comment, about the final job results. When installing a 95 efficient gas furnace, they had to install separate vents for the fresh air intake and the exhaust. The results were to white PVC pipes sticking out of the front of my house. The furnace in located in the basement and in the front corner of the house. It may have been better to have the pipes sitcking out the side of the house instead. And may be use a different color that wouldn't be as noticeable.