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These self-contained heating devices are fueled by gas, oil, electricity, steam, or hot water. Each unit has a heat exchanger and air-moving fan or blower to deliver heated air to a space. They are individually suspended over the area to be heated Unit heaters are usually spaced evenly to give good air coverage with their air patterns complimenting each other. They can be equipped with turning vanes, which direct the discharge air in a desired path, primarily toward the floor.
A circular air pattern is the most effective arrangement. Heat is...