Photo 1 of Fits 20x16 and 16x20 Duct Opening | Aluminum Eggcrate Return Air Grille | Low Noise & High Air Flow, Rust Proof Vent Cover Grill for Sidewall & Ceiling | White | Outer Dimensions: 21.75" X 17.75"

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Photo 1 of Fits 20x16 and 16x20 Duct Opening | Aluminum Eggcrate Return Air Grille | Low Noise & High Air Flow, Rust Proof Vent Cover Grill for Sidewall & Ceiling | White | Outer Dimensions: 21.75" X 17.75"Photo 2 of Fits 20x16 and 16x20 Duct Opening | Aluminum Eggcrate Return Air Grille | Low Noise & High Air Flow, Rust Proof Vent Cover Grill for Sidewall & Ceiling | White | Outer Dimensions: 21.75" X 17.75"