This access panel is compatible with Unilux VFC units and other vertical fan coils with a 14-inch by 52-inch opening.We make return air access panels with 20-gauge steel and powder-coat them in a baked enamel finish. The result is an incredible durable fan coil cover with a smooth, glossy white finish that looks excellent in any room.The access panel is designed with an air filter channel, lower louvered vents and a hinged removable door with a built-in hand grip. The design makes accessing the fan coil and filter incredibly easy. The filter channel is located directly behind the louvered vents to ensure that all air entering the fan coil is filtered. It holds air filters up to 1.7-inches thick.Place an order for a new access panel now.VFC Unit opening Measures 14in x 52in. Front of cover, outside to outside measures 16inx 52in