A tighter built home means less outside air infiltrating in the home, which means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" surrounding air, which has to be "made up" with fresh air. If air cannot type in the home as easily anymore, this can cause serious issues. As the surrounding air is utilized for combustion, rather than substituted with oxygen, a negative pressure inside the space can happen. This could create combustion problems for the furnace, plus burn up fresh air for anybody inside the home. Car performance is a lot more than the ability of a vehicle to achieve top speeds to make sharp turns; it also is related to the best performance of their components. It is the hundreds of car parts, through the smallest screws and spark plugs towards the big tires, group in harmony that defines car performance. It is these parts that enable motorists to see the exhilaration of driving or operating a well-maintained vehicle.