Photo 1 of Fits 12x4 Duct Opening | Steel Baseboard Return Air Grille by Handua | Vent Cover Grill | 7/8" Margin Turnback [Depth] to Fit Baseboard | White | Outer Dimensions: 13.75"W X 5.75 "H 1 12"W x 4"H [Duct Opening]

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Photo 1 of Fits 12x4 Duct Opening | Steel Baseboard Return Air Grille by Handua | Vent Cover Grill | 7/8" Margin Turnback [Depth] to Fit Baseboard | White | Outer Dimensions: 13.75"W X 5.75 "H 1 12"W x 4"H [Duct Opening]