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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. Have you heard from the most recent trend popular called Eco-Fashion? Eco-Fashion features a new environmental and socially conscious design group who strives to save both planet as well as the people in it. Choolips is new company. Created by the winner of the Design4Life fashion competition, Annagret Affolderbach (whose designs for the program sold out within days) Choolips' goal is to create sustainable eco-fashion which will support residents and provides to other locations economies. When tractors were first developed, they used enormous steam engines that were notoriously unreliable and hard to maintain. These were phased out around the turn with the twentieth century and substituted for internal combustion engines which were smaller though powerful and ran on a number of fuels including kerosene, ethanol and gasoline. By the 1960s several of these engines were phased out and only more effective internal combustion engines that ran on diesel and after this, biodiesel.