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6. The use of smaller words and shorter sentences The manual wheelchair has been around use for many years and has gone through many changes. The constant feature has been that this chair is self propelled by pushing for the hand edges that surround the wheels. The owner actually pushes the wheels around and around to get in one location to another. In addition to that, the footrests with a manual wheelchair is easy to remove and the user can walk the chair forward together with his feet. 4. The number of arguments which 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.