18"W X 24"H [Duct Opening] ALUMINUM RETURN GRILLE - EASY AIR FLOW - LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 25.875"H] flat stamped steel 1/2" White insulation will give MFACRA88W1 Condensate Pump Product Details Size 20
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Description
18"W X 24"H [Duct Opening] ALUMINUM RETURN GRILLE EASY AIR FLOW LINEAR BAR GRILLES [OUTER DIMENSIONS: 19.875"W X 25.875"H] flat stamped steel 1 2" White insulation will give MFACRA88W1 Condensate Pump Product Details Size 20 1 2" White insulation will give you a good R value of 3 and matte black