36"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 37.75"w x 27.75"h] 14" Diameter + Product Details Universal Fit Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Universal Fit - Accommodates almost any thermostat with dimensions of 8-1/4" H x 5-3/8" W x 3-1/2" D

Actual Filter Size – 7 3/4"w x 23 3/4" x 1"

which the interior PET provides

+ Product Details Size – 12"w X 24"h is the size for the duct opening measurement only

Actual Filter Size – 31 3/4"w x 35 3/4" x 1"

36"w X 26"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 37.75"w x 27.75"h] 14" Diameter + Product Details Universal Fit Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Universal Fit Accommodates almost any thermostat with dimensions of 8 1 4" H x 5 3 8" W x 3 1 2" D Actual Filter Size – 7 3 4"w x 23 3 4" x 1"