18"W X 18"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 19.875"H] 8in diameter you can watch this informative MFACRA88W1 Condensate Pump Product Details Size 20
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18"W X 18"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 19.875"H] 8in diameter you can watch this informative MFACRA88W1 Condensate Pump Product Details Size 20 you can watch this informative video tutorial: How to Measure Your Vent Hole Before Ordering a Grille actual front end outer dimensions are approximately 12 5 8" width X 24 5 8" height