A log holder {andiron} allows air to flow from under logs up through chimney {fireplace}|. Just above fireplace is chimney throat, which contains a hinged metal plate, to open or close throat {damper}. Behind damper is space {smoke box} to collect smoke, in case of temporary downdraft. A passageway {flue} goes up chimney. A glass fire screen is desirable. Chimney should be at least 12 meters high, extend above roof by 60 centimeters, and be at least 400 square centimeters in area. There should be masonry firebox.
Heaters {forced air heater}| can use a fan to blow hot air.
Stoves {Franklin stove}| can be a free-standing fireplace, raised off floor, in room middle, with exhaust pipe leading straight up to ceiling.
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.
Natural gas from jets burns, warms air, causes air to rise, and pulls in more air from below {gas heater}|.
Heat pumps {heat pump}| can transfer heat from underground water to house. They work like air conditioners in reverse.
Heaters {space heater}| can have no blower. Convection moves air.
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Date Modified: 2022.0225