Home / HVAC / Furnace Door Cap 328079-403 Furnace Door Cap 328079-403$7.54 Price may not be up-to-date. In Stock View Product Part Number: 328079-403 Brand: CARRIER BOCK Seller: Sears PartsDirect Category: HVAC 60-day return policy Description This door cap (part number 328079-403) is for furnaces. Door cap 328079-403 covers a hole in the furnace door. Wait until the surface is cool to the touch before installing this part.