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Apparatus and method for ventilation of animal enclosures

  • US 4,241,871 A
  • Filed: 11/27/1978
  • Issued: 12/30/1980
  • Est. Priority Date: 11/27/1978
  • Status: Expired due to Term
First Claim
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1. In an animal enclosure of the differential-pressure forced-ventilation type the walls of which are substantially closed except for a plurality of inlet apertures therein for the ingress of ventilating air and a plurality of exhaust apertures therein for the egress of ventilating air, such enclosure having an electrically driven exhaust fan at each such exhaust aperture, a plurality of electrical thermostats set to operate at respective selectable temperatures within a range of temperatures through which such enclosure is expected to operate and each controlling at least one such exhaust fan, and closure means for each such inlet aperture variably positionable with respect thereto so as to control the effective size thereof, a ventilation control system comprising:

  • means for comparing the barometric pressure within such enclosure with that outside such enclosure,electromechanical drive means responsive to the output of said pressure-comparing means and mechanically connected to such closure means to move the latter in the aperture-opening direction in response to a sensed pressure differential in excess of a preselected amplitude and to move such closure means in the aperture-closing direction in response to a sensed pressure differential less than a preselected amplitude, andmeans responsive to the actuation of that one of such thermostats which is set to be operated at the highest selected temperature in such operating temperature range to operate said electromechanical drive means in the aperture-opening direction irrespective to the nature of the output of said pressure-comparing means.

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