I appreciate everyones input and advice. Today we had the builder, HVAC contractor and city code administrator get together to review the situation and the conclusion they came to was: The lack of a high/low combustion air setup was wrong. The air exchange between the living space and attic space was wrong and the quantity of combustion air was wrong. This was my first confrontation with the city and a builder and fortunately I was correct and get to preserve my reputation for another day. This was a learning experience that I hope I don't have to repeat. Thanks again for all the input.