"Factory-applied weatherstripping on doors is only a recent innovation. As a result, the exterior doors in thousands of homes throughout the state possess little or not weather stripping. Most doors are installed with a space between the bottom of the door and the floor or threshold. Sometimes this space can amount to as much as one fourth of an inch or more. If weather stripping is not used this crack allows large amounts of air to flow in and out of the house. This is known as infiltration."--First paragraph.
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