Air ventilation box for use in mechanical air treating and ventilating systems in e.g. tertiary building, has airflow guiding nozzle arranged in internal space of box and between inlet orifice and suction opening of centrifugal fan

摘要

The box (1) has a centrifugal fan (6) provided with a delivery opening (7) that is connected to an airflow outlet orifice (5) and a suction opening (8). The centrifugal fan is arranged in an internal space of the box and between an airflow inlet orifice (4) and the outlet orifice. An airflow guiding nozzle (9) is arranged in the internal space of the box and between the inlet orifice and the suction opening of the centrifugal fan. The guiding nozzle is provided with a perforated surface, and fixed to an internal panel (12) of the box at the level of the inlet orifice.