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Bard 539-405 is an OEM intake sealing frame assembly used with Bard wall-mount ventilation and economizer packages to properly seal the outdoor air intake area inside the unit. This frame helps direct incoming ventilation air where it belongs while reducing bypass air that can hurt performance, contribute to unwanted drafts, or allow debris and moisture intrusion around the intake section. It is commonly shown in Bard CRV ventilation and ECON economizer installation instructions as the sealing frame installed alongside the lower block off plates and foam gaskets, so it is a smart replacement when servicing a damaged or missing frame during a ventilator or economizer install or retrofit. Confirm fit by matching your unit and accessory model to the correct Bard parts list before ordering.