30"W X 8"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 31.75"W X 9.75"H] flat stamped steel Installation Location – Floor MFACRA88W1 Condensate Pump Product Details Size 20
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30"W X 8"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 31.75"W X 9.75"H] flat stamped steel Installation Location – Floor MFACRA88W1 Condensate Pump Product Details Size 20 Installation Location – Floor + Product Details Size 12"w X 18"h is the size for the duct opening measurement only