A negative pressure wound therapy system , comprising: - a negative pressure source , - a wound cover member having a suction interface , - a wound side assembly connected to the suction interface , the wound side assembly comprising: - a fluid removing conduit , - an air supplying conduit , and - a wound side connector connected to the fluid removing conduit and the air supplying conduit , and - a connector device , comprising: - a connector housing having a connector housing device side and an opposite connector housing coupling side , - a fluid outlet connected to the connector housing , - an air filter , - an air feeding port connected to the filter , - air feeding conduit comprising the air feeding port and an air inlet opening , the air inlet opening arranged on the connector housing device side , and - coupling means , wherein: - the fluid outlet is connected to the negative pressure source , - the connector device is adapted to be connected to the wound side connector at the connector housing coupling side , - the coupling means is adapted to engage with the wound side connector to: - fluidly connect the fluid removing conduit to the fluid outlet , and - fluidly connect the air supplying conduit to the air feeding port to allow ambient air to be supplied at a controlled air leakage rate to the air supplying conduit through the air filter . - a negative pressure source , - a wound cover member having a suction interface , - a wound side assembly connected to the suction interface , the wound side assembly comprising: - a fluid removing conduit , - an air supplying conduit , and - a wound side connector connected to the fluid removing conduit and the air supplying conduit , and - a fluid removing conduit , - an air supplying conduit , and - a wound side connector connected to the fluid removing conduit and the air supplying conduit , and - a connector device , comprising: - a connector housing having a connector housing device side and an opposite connector housing coupling side , - a fluid outlet connected to the connector housing , - an air filter , - an air feeding port connected to the filter , - air feeding conduit comprising the air feeding port and an air inlet opening , the air inlet opening arranged on the connector housing device side , and - coupling means , - a connector housing having a connector housing device side and an opposite connector housing coupling side , - a fluid outlet connected to the connector housing , - an air filter , - an air feeding port connected to the filter , - air feeding conduit comprising the air feeding port and an air inlet opening , the air inlet opening arranged on the connector housing device side , and - coupling means , - the fluid outlet is connected to the negative pressure source , - the connector device is adapted to be connected to the wound side connector at the connector housing coupling side , - the coupling means is adapted to engage with the wound side connector to: - fluidly connect the fluid removing conduit to the fluid outlet , and - fluidly connect the air supplying conduit to the air feeding port to allow ambient air to be supplied at a controlled air leakage rate to the air supplying conduit through the air filter . - fluidly connect the fluid removing conduit to the fluid outlet , and - fluidly connect the air supplying conduit to the air feeding port to allow ambient air to be supplied at a controlled air leakage rate to the air supplying conduit through the air filter . <EOS>