A system for performing an endoscopic surgical procedure in a surgical cavity , comprising: a) a gas delivery device having a disposable filter cartridge received therein, wherein the gas delivery device is configured to deliver a flow of pressurized gas to a gas delivery lumen extending from the filter cartridge ; b) a gaseous sealing module communicating with a distal end of the gas delivery lumen remote from the filter cartridge and configured to generate a gaseous seal within a gas sealed lumen extending therefrom; wherein the gaseous sealing module includes a housing that supports a nozzle tube defining a plurality of circumferentially spaced apart gas jets recessed in an outer peripheral surface thereof for accelerating pressurized gas received from the gas delivery lumen to generate the gaseous seal within the gas sealed lumen , and wherein gas spent generating the gaseous seal is sent from the gaseous sealing module back to the filter cartridge received in the gas delivery device through a gas return lumen , and wherein the nozzle tube is dimensioned and configured for engagement within a nozzle bore formed in a central plenum area of the housing to form radially outer boundaries of the plurality of circumferentially spaced apart gas jets recessed in the outer peripheral surface of the nozzle tube ; and c) an access port communicating with a distal end of the gas sealed lumen so as to provide mechanically sealed instrument access to the surgical cavity and maintain a stable pressure by way of the gaseous seal within the gas sealed lumen and facilitate smoke evacuation within the surgical cavity . a) a gas delivery device having a disposable filter cartridge received therein, wherein the gas delivery device is configured to deliver a flow of pressurized gas to a gas delivery lumen extending from the filter cartridge ; b) a gaseous sealing module communicating with a distal end of the gas delivery lumen remote from the filter cartridge and configured to generate a gaseous seal within a gas sealed lumen extending therefrom; wherein the gaseous sealing module includes a housing that supports a nozzle tube defining a plurality of circumferentially spaced apart gas jets recessed in an outer peripheral surface thereof for accelerating pressurized gas received from the gas delivery lumen to generate the gaseous seal within the gas sealed lumen , and wherein gas spent generating the gaseous seal is sent from the gaseous sealing module back to the filter cartridge received in the gas delivery device through a gas return lumen , and wherein the nozzle tube is dimensioned and configured for engagement within a nozzle bore formed in a central plenum area of the housing to form radially outer boundaries of the plurality of circumferentially spaced apart gas jets recessed in the outer peripheral surface of the nozzle tube ; and wherein the gaseous sealing module includes a housing that supports a nozzle tube defining a plurality of circumferentially spaced apart gas jets recessed in an outer peripheral surface thereof for accelerating pressurized gas received from the gas delivery lumen to generate the gaseous seal within the gas sealed lumen , and wherein gas spent generating the gaseous seal is sent from the gaseous sealing module back to the filter cartridge received in the gas delivery device through a gas return lumen , and wherein the nozzle tube is dimensioned and configured for engagement within a nozzle bore formed in a central plenum area of the housing to form radially outer boundaries of the plurality of circumferentially spaced apart gas jets recessed in the outer peripheral surface of the nozzle tube ; and c) an access port communicating with a distal end of the gas sealed lumen so as to provide mechanically sealed instrument access to the surgical cavity and maintain a stable pressure by way of the gaseous seal within the gas sealed lumen and facilitate smoke evacuation within the surgical cavity . <EOS>