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EZ-FLO's 30 in. x 20 in. Return Air Grille is used for sidewall or ceiling installation. The all steel construction and powder coated finish makes this diffuser a long-lasting, durable choice. The included hardware makes for a quick and easy installation. EZ-FLO's Return Air Grille will ensure maximum airflow. Outer measurements are 31-3/4 in. x 21-3/4 in.