4. Stoves and furnaces
  5. Hot-air furnaces
  6. Feeding air
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Balancing air device for a heating unit

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Bi-loop heat recovery system

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Bi-loop heat recovery system for an oil fired furnace

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Combustion heater

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Controlled air intake apparatus for furnaces and the like

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Controlled air intake apparatus for furnaces and the like

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Excess air control

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Excess air control with dual pressure switches

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Furnace

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Gas furnace energy saver

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Gas-fired heater means

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Home heating system

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Noise reducing heat exchanger assembly for a combustion system

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Retrofittable energy conserving damper

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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Thermostatic regulated air flow controller

Stoves and furnaces – Hot-air furnaces – Feeding air
Patent

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