28"W X 20"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 29.75"W X 21.75"H] Insulated Line Set & EN 13180 standards MFACRA88W1 Condensate Pump Product Details Size 20
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Description
28"W X 20"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 29.75"W X 21.75"H] Insulated Line Set & EN 13180 standards MFACRA88W1 Condensate Pump Product Details Size 20 & EN 13180 standards + Product Details Size 26"w X 4"h is the size for the duct opening measurement only