A climate chamber and method for treating products, such as eggs to be hatched, with a conditioned gas stream. The climate chamber includes a substantially closed compartment having two opposing lateral walls provided with one or more passages, and a substantially closed channel which extends around the outside of the compartment and connects one of said lateral walls to the other of said lateral walls in order to form together with the compartment a substantially closed circuit. The product is placed in the climate chamber, and then the conditioned gas is circulating through the circuit. The direction in which the conditioned gas stream is circulated through the circuit is reversed repeatedly.
