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Cabinet controller

  • US 4,784,675 A
  • Filed: 04/04/1988
  • Issued: 11/15/1988
  • Est. Priority Date: 09/02/1986
  • Status: Expired due to Fees
First Claim
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1. An air-filtering system comprising:

  • a cabinet defining a confined interior equipment-containing space into which said air is admitted and maintained at a positive pressure relative to ambient atmospheric pressure external to said cabinet;

    a housing having an inlet for admitting air into said housing from the ambient atmosphere external to said housing and having outlet means for delivering air from said housing into said equipment-containing space within said cabinet;

    a canister having its own outlet opening and its own inlet opening and disposed within said housing, said canister containing an air filtration material located between said canister inlet opening and said canister outlet opening with said canister being in a position to enable air flow between said canister openings through said material;

    propelling means disposed within said housing and so located in position relative to said canister as to move the air from said housing inlet in a downstream direction through said canister inlet opening, said filtration material and said canister outlet opening on through said housing outlet and into said equipment-containing space;

    means located within said air filtering system for controlling said propelling means in response to the flow of said air through said housing in order to maintain essentially continuously a selected constant rate of air flow through said housing outlet and into said cabinet in compensation for changes in impedance of said material to air flow through said material;

    said propelling means being located downstream of said air flow through said material;

    and means for disposing said controlling means downstream from said propelling means directly in the path of said air flowing from said propelling means and ultimately toward said housing outlet.

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