A method of manufacturing a ventilation diffuser bag includes providing a perforated, occupant facing side of the diffuser bag and an air mover; molding a non-perforated, support facing side of the diffuser bag having an opening to allow air flow therethrough and including an integral air mover support, the air mover support including an endless sidewall extending from the opening for supporting the air mover, the endless sidewall including a retaining edge spaced from the non-perforated side for suspendably retaining the air mover, and a vibration dampening suspension portion; mounting the air mover in the air mover support such that the air mover engages the retaining edge; disposing an air permeable material adjacent the non-perforated side; and permanently connecting edges of the perforated, occupant facing side to edges of the non-perforated, support facing side such that the air permeable material is disposed between the perforated side and the non-perforated side.