The application relates to an apparatus for providing a gas for the introduction thereof into an incubation chamber, comprising an inlet port (1) for introducing a gas, an outlet port (2) for discharging a gas, a first gas path (3) connecting the inlet port (1) to the outlet port (2), a second gas path (4) branching off from the first gas path (3) and running back into the first gas path (3); a distributing element (5), configured to allow a portion of the gas introduced through the inlet port (1) to be conducted via the second gas path (4), and an enriching element (6) arranged in the second gas path for enriching the gas flow with a liquid.