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Bard 509-245 is an OEM Supply Box Back panel used in compatible Bard wall mount HVAC supply box assemblies to close off the rear of the supply box, protect internal duct connection components, and help maintain a secure, properly aligned installation. When a supply box is damaged, corroded, or previously modified in the field, replacing the back panel with the correct Bard factory part helps restore correct fit and support so the supply box can mount cleanly and the discharge connection stays stable. Confirm compatibility by matching your unit model and the supply box assembly parts breakdown, since supply box configurations can vary by series and capacity.