18"W X 18"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 19.75"H] Color_Anodized Aluminum actual front end outer dimensions MFACRA88W1 Condensate Pump Product Details Size 20
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18"W X 18"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 19.75"W X 19.75"H] Color_Anodized Aluminum actual front end outer dimensions MFACRA88W1 Condensate Pump Product Details Size 20 actual front end outer dimensions are approximately 28 5 8" width X 18 5 8" height + Product Details Size 24"w X 24"h is the size for the duct opening measurement only