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When a plan is finally formulated it usually looks something like this; you are going on a diet of some kind and if you are really motivated start a workout program. This makes sense because everybody knows that the fewer calories we take in the more fat we are able to lose. Add jogging a few times a week plus some sit-up and before long that rebellious stomach is going to be put back in its place. A tighter built home means less outside air infiltrating in the home, which in turn means less oxygen to use for combustion within the furnace. As the furnace burns fuel and oxygen for combustion, it "eats up" the nearby air, which has to be "made up" with fresh air. If air cannot type in the home as quickly anymore, this could cause serious issues. As the surrounding air can be used for combustion, and not substituted for fresh air, a bad pressure in the space can take place. This could create combustion trouble for the furnace, plus consume fresh air for any person inside home.