36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - Black [Outer Dimensions 37.75"w x 37.75"h] Insulated Line Set actual front end outer dimensions Product Details Size 30 LO1828 12in diameter

actual front end outer dimensions are approximately 22 5/8" width X 36 5/8" height

+ Product Details Size - 12"w X 8"h is the size for the duct opening measurement only

and slashes energy costs

Actual Filter Size – 35 3/4"w x 33 3/4" x 1"

+ Product Details Size - 8"w X 16"h X 2"d (for duct opening measurement only)

36"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh Black [Outer Dimensions 37.75"w x 37.75"h] Insulated Line Set actual front end outer dimensions Product Details Size 30 LO1828 12in diameter actual front end outer dimensions are approximately 22 5 8" width X 36 5 8" height + Product Details Size 12"w X 8"h is the size for the duct opening measurement only