18"W X 4"H [Duct Opening] Steel Air Vent Return Grille - HVAC VENT DUCT COVER DIFFUSER - [Outer Dimensions: 19.75"W X 5.75"H] White 3 * insulation density is MFACRA88W1 Condensate Pump Product Details Size 20
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18"W X 4"H [Duct Opening] Steel Air Vent Return Grille HVAC VENT DUCT COVER DIFFUSER [Outer Dimensions: 19.75"W X 5.75"H] White 3 * insulation density is MFACRA88W1 Condensate Pump Product Details Size 20 3 * insulation density is 30kgs cbm = 0 How to Measure Your Vent Hole Before Ordering a Grille