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The Bard RG-5W is an OEM return air grille built for a 30 x 16 return opening, helping protect the return path while maintaining consistent airflow back to the unit. It uses a rigid aluminum frame with fixed return blades and is commonly specified for Bard wall mounted systems where a clean, properly sized return grille is required to keep performance steady and reduce rattles or air bypass caused by mismatched grilles. Nominal grille size is 30 x 16, with outside dimensions approximately 34-1/4 x 20-1/4, so verify your existing cutout and overall flange size before ordering to ensure the correct fit.