A device (1) for treating organic materials, in particular a compost tunnel, having a nozzle base (2), a roof (5), at least one rear wall (4), and two side walls (10, 11) that delimit the interior (3) of the device (1). Extending in the nozzle base (2) is a plurality of tubes (7) that are connected to nozzles in the nozzle base (2) that are directed toward the interior (3) of the device (1). The tubes (7) are connected to a process gas apparatus (12, 9) which is designed for supplying the tubes (7) with a process gas, in particular air, as needed. The process gas apparatus (9, 12) includes a pressure chamber (9) and a ventilator (12). The ventilator (12) is connected to the pressure chamber in such a way that it can feed the pressure chamber with process gas. The pressure chamber (9) has at least one outlet that is connected to at least one of the tubes (7) in the nozzle base (2), so that the process gas may be conducted from the pressure chamber (9) into the tubes (7) to be fed. The ventilator (12) and the p
