Heaters {furnace, heater} {hot air heating} can heat air by electricity or by burning oil, natural gas, or coal carried into furnace by pipe or conveyor {stoker, furnace}. Air blows through ducts to rooms. Screened openings {register, furnace} in floor or walls have louvers to direct airflow. Air returns to furnace through main duct.
Practical Affairs>Machine>Kinds>Heat>Heater
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Date Modified: 2022.0224