Blower assembly having resonators and resonator assembly

A centrifugal blower assembly comprising:

• a centrifugal fan defining an air inlet at a center of the centrifugal fan, a plurality of air outlets at an outer periphery of the centrifugal fan, and a plurality of blades at the air outlets;
• a scroll casing housing the centrifugal fan, the scroll casing including a scroll starting position, a scroll ending position and an air passage extending between the scroll starting and ending positions, the scroll ending position being downstream from the scroll starting position relative to airflow through the scroll casing;
• an air outlet extending from the scroll ending position;
• and
• a plurality of resonators mounted on an exterior surface of the air outlet, each of the plurality of resonators having respective cavities in fluid communication with inside of the air outlet, wherein
• each of the cavities has respective different volumes from each other,
• the scroll casing has a plurality of stubs formed in the air outlet, the plurality of stubs protruding outward from the air outlet,
• each of the plurality of stubs has respective openings, each of the openings passing through the plurality of stubs, respectively,
• each of the plurality of the stubs fits in the respective cavities so that each of the openings is in fluid communication with the respective cavities,
• each of the plurality of stubs is in a cylindrical, elliptical or rectangular shape and hollow, and
• the plurality of stubs has respective flanges that expand in respective radial directions thereof.