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Bard part 913-0077 is an OEM CHDM air channel retrofit component used with Bard CH series dehumidifier module installations to properly direct airflow through the added dehumidifier section and back into the wall mount unit. In the field, this air channel helps prevent bypass air and supports correct dehumidification performance by keeping the air path sealed and routed where Bard intended, which is especially important when retrofitting a CH unit that was not originally equipped with the CHDM kit. Because retrofit applications can vary by model and vintage, confirm fit by matching the CH unit model and the CHDM installation instructions before ordering, and replace any disturbed insulation or foam pieces as required during installation.