Began to supersede the fireplace about 1900
- Originally iron furnace stood in middle of a basement hand fired by coal
- Sheet metal enclosure surrounding it.
- Opening in side admitted combustion air.
- Short duct from top of enclosure delivered warm air to a large grille in the middle of the floor of the parlor
- other rooms were heated by communication with this room
Modern Warm Air Furnaces
- Automatic firing of oil or gas
- Operational and safety controls
- ducted air to and from each room
- Blowers / fans to move air
- Filters for Indoor Air Quality
- Adjustable registers
Uniform conditions and reasonably equal temp's in all parts of a building
Building can be quickly warmed
Cleans the recirculated and outdoor air with filters
Air can be circulated without heat introducing fresh air
Central cooling can be incorporated if ducts are sized to handle the greater rate of air flow required.
Humidifier can be added if needed.
Dehumidification can be accomplished if cooling is included in the design
Supply registers in floor below areas of glass is common, minimizing heat loss at the windows.
High return grills pick up warmer air for reheating
Furnace located reasonably close to middle of building.
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