Round Perforated Grilles combine versatility and modern aesthetics of a flowing circular design with superior performance and high quality. …Round Perforated Grilles combine versatility and modern aesthetics of a flowing circular design with superior performance and high quality. read more Models RPG - Round Perforated Grilles Submittals All Submittals Combined Individual Submittals RPG • Round Grille • Perforated Performance Data RPG • Round Perforated Grilles • Performance Data