Patents Assigned to Rapid Engineering Inc.
  • Internal recirculation device
    Patent number: 4325352
    Abstract: A method for converting a direct fired gas heating apparatus from one having a constant volume discharge air flow characteristics to one having variable volume characteristics by the use of an internally recirculating volume discharge air flow increment.
    Type: Grant
    Filed: September 26, 1980
    Date of Patent: April 20, 1982
    Assignee: Rapid Engineering Inc.
    Inventor: James V. Dirkes