HVAC Premium 18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 19.75"w x 19.75"h] w24h24 Design – Fixed Hinged for Compatible With Duct 7in Applications This sheet metal DDAG-A-1212

Design – Fixed Hinged for easy filter change & cleaning - uses a 1" thick filter

Example: If your hole is 20" wide by 14" tall

Actual Filter Size – 19 3/4"w x 25 3/4" x 1"

height: 22px

+ Product Details Size – 16"w X 36"h is the size for the duct opening measurement only

HVAC Premium 18"w X 18"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 19.75"w x 19.75"h] w24h24 Design – Fixed Hinged for Compatible With Duct 7in Applications This sheet metal DDAG A 1212 Design – Fixed Hinged for easy filter change & cleaning uses a 1" thick filter Example: If your hole is 20" wide by 14" tall