18"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 9.75"h] Color_Anodized Aluminum + Product Details Size - MFACRA88W1 Condensate Pump Product Details Size 20
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18"w X 8"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 19.75"w x 9.75"h] Color_Anodized Aluminum + Product Details Size MFACRA88W1 Condensate Pump Product Details Size 20 + Product Details Size 36"w X 24"h is the size for the duct opening measurement only you have 16 different varieties to choose from