Patent ID: 8522770
Filing Date: 2013-09-03
Classification: F24C

Abstract:
1. A system for operating a replaceable appliance that may produce polluted air, comprising a recirculating ventilation system, wherein said recirculating ventilation system includes a structure having a base, an intake, and an exhaust, wherein said base includes a base duct section, wherein said base duct section is connected for bringing air taken in through said intake to said exhaust, wherein said base duct section has a first configuration and a second configuration, wherein when said base duct section is in said first configuration said base duct section includes a platform pan that acts as a top surface and encloses said base duct section from above, wherein when said base duct section is in said second configuration said platform pan is removed and said base duct section is open to an environment that is external to the system via an opening created by the absence of said platform pan, wherein enclosing and opening said base duct section with said platform pan allows said base duct section to go back and forth between said first configuration and said second configuration, wherein when said platform pan encloses said base duct section said platform pan is positioned for supporting the replaceable appliance on said base, wherein said exhaust is positioned in said base for exhausting air from said base duct section, and wherein when air is exhausted from said exhaust said exhausted air is drawn to said intake to provide an air curtain.