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4. The number of arguments they make 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. Balsa wood can be a lightweight wood variety taken from trees of the name that hail from your rainforests of Central America, South America, plus some other regions. The warm and humid conditions in these areas are fantastic for the development of this plant. Balsa trees grow very rapidly - it usually takes only a decade for any tree being mature enough for cutting. However, once past the ten-year marker, an unharvested tree would harden on the exterior and rot inside, making this a useless piece.