Gas exchange unit, method for producing a gas exchange unit and kit with a gas exchange unit and a humidifying and heating device

A Gas exchange unit with a hollow-fibre module, characterised in that a gas flow characteristic of the hollow-fibre module is adaptable,

• wherein an overflow device is provided on the hollow-fibre module to allow different charging of fibre regions by means of differing pressure gradients,
• wherein the overflow device provides a plurality of gas-chambers connected together by gas-overflow-channels,
• wherein in addition to the overflow device an overlay is applied directly on a fibre bundle of a side surface of the hollow-fibre module,
• wherein the overlay is different from the overflow device;
• and
• wherein the overlay has a continuous pneumatic resistance gradient to increase the pneumatic resistance.