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Particulate abatement and environmental control system

  • US 5,090,972 A
  • Filed: 02/06/1991
  • Issued: 02/25/1992
  • Est. Priority Date: 04/25/1990
  • Status: Expired due to Fees
First Claim
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1. A method of providing an improved temporary working environment during removal or encapsulation of hazardous particulate material from a working space substantially sealed from space exterior of the working space, the method comprising:

  • powering one or more portable air moving units for exhausting air including hazardous particulate material from the defined working space and maintaining a negative pressure within the working space with respect to the space external of the working space;

    monitoring the level of negative pressure within the working space;

    filtering the exhausted air to remove the hazardous particulate material;

    discharging a first portion of the exhausted air to the space exterior of the working space;

    powering a portable conditioning unit to condition a second portion of the exhausted air, the second portion of the exhausted air being defined by the exhausted air less the discharged air;

    returning the conditioned air to the working space; and

    regulating the amount of the first portion of the exhausted air in response to the monitored level of negative pressure.

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