Openings in a blower housing for noise reduction

A system for a motor vehicle, the system comprising:

• a heat exchanger;
• a fan arrangement for the heat exchanger, the fan arrangement including:
• a fan cowling spaced from the heat exchanger in an air supply direction and which covers an air passage area of the heat exchanger;
• a sealing part which couples the fan cowling to the heat exchanger;
• a fan arranged in the fan cowling downstream of the heat exchanger in the air supply direction;
• a plurality of upper air passages arranged at a lower region of the sealing part;
• and
• a plurality of lower air passages arranged at an upper region of the sealing part and arranged spatially opposite to the upper air passages,
• wherein an opening of each of the upper and lower air passages is sized such that:
• in a direction perpendicular to the air supply direction is at least 0.025 of the diameter of the fan;
• and
• in a direction of the air supply, is at least 0.0025 of the diameter of the fan.

A motor vehicle, comprising:

• a heat exchanger;
• a fan arrangement for the heat exchanger, the fan arrangement including:
• a fan cowling spaced from the heat exchanger in an air supply direction and which covers an air passage area of the heat exchanger;
• a sealing part which couples the fan cowling to the heat exchanger;
• a fan arranged in the fan cowling downstream of the heat exchanger in the air supply direction;
• a plurality of upper air passages arranged at a lower region of the sealing part;
• and
• a plurality of lower air passages arranged at an upper region of the sealing part and arranged spatially opposite to the upper air passages,
• wherein an opening of each of the upper and lower air passages is sized such that:
• in a direction perpendicular to the air supply direction is at least 0.025 of the diameter of the fan;
• and
• in a direction of the air supply, is at least 0.0025 of the diameter of the fan