Patents Assigned to Johnston Engineering Company
  • Air-conditioning duct filtering system
    Patent number: 8814971
    Abstract: An air conditioning system duct housing has a plurality of walls coupled together, having at least one outside air intake, at least one return air intake and an air supply outlet channel; a filter; and a receiving aperture (mixed air plenum) to receive the filter therein, wherein the receiving aperture (mixed air plenum) is interposed between the at least one outside air intake, the at least one return air intake and the air supply outlet channel.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: August 26, 2014
    Assignee: Johnston Engineering Company
    Inventor: Thomas W. Johnston