28"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 29.75"w x 37.75"h] 2-Way + Product Details Size - Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

+ Product Details Size - 22"w X 12"h X 2"d (for duct opening measurement only)

Actual Filter Size – 11 3/4"w x 19 3/4" x 1"

actual front end outer dimensions are 23

+ Product Description Protect and secure your thermostat with this high-quality Clear Plastic Thermostat Guard

+ Product Details Perfect Fit & Easy Sizing - Designed for a 18" x 16" OR 16" X 18" duct opening (measured at the opening)

28"w X 36"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 29.75"w x 37.75"h] 2 Way + Product Details Size Compatible With Duct 7in Applications This sheet metal DDAG A 1212 + Product Details Size 22"w X 12"h X 2"d (for duct opening measurement only) Actual Filter Size – 11 3 4"w x 19 3 4" x 1"