Air intake device for a system of ventilation stream 27, a simple mechanical

摘要

The air intake (1) which is fixed to an air inlet (50) in a wall (5) is provided with an air flow limiter (3) and air filter (2). The air filter has a removable filter element (4) including a choking indicator (7). The indicator has a movable pointer (70) displaying the degree of choking up of the filter to allow its replacement when the air flow rate is less than a pre-specified threshold.