4. Automatic temperature and humidity regulation
  5. Hot-air furnace
  6. Air and fire control
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Flame control system for heat exchanger

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Forced air heating system

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Forced air heating system utilizing fireplace as primary heat so

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Furnace control apparatus having a circulator failure detection

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Furnace controller useable, without modification, with either a

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Furnace fan control

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Furnace having a normally closed blower relay

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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Furnace monitoring and thermostat cycling system for recreationa

Automatic temperature and humidity regulation – Hot-air furnace – Air and fire control
Patent

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