4. Ventilation
  5. Having forced recirculation
  6. Including automatic control means

Johnson Service Co.

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Method and apparatus for controlling ventilation rates and indoo

Ventilation – Having forced recirculation – Including automatic control means
Patent

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Motor current status sensor

Communications: electrical – Condition responsive indicating system – Specific condition
Patent

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Pressure dependent variable air volume control strategy

Automatic temperature and humidity regulation – Ventilator type – Electrically actuated
Patent

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