Abstract: An apparatus cabinet comprising one or more equipment bays, and at least one apparatus unit emitting heat in the equipment bay, the apparatus cabinet further comprising one or more inlets for drawing cooling air into the apparatus cabinet for cooling said apparatus unit, and one or more outlets for dissipating the air used for cooling from the apparatus cabinet, and the apparatus cabinet comprising a pressurization space and one or more fans interconnected to the pressurization space for changing the air pressure in the pressurization space to be different from the air pressure in the equipment bay, and a partition for separating the equipment bay and the pressurization space at least partly from one another, the partition comprising one or more air nozzles for conveying the air between the pressurization space and the equipment bay.