Fits 18x12 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 19.75"W X 13.75"H (18" W x 12" H Duct Opening)The Listed size 18"x12" is for inside duct opening measurement, actual outside dimension is 19. 75"x13. 75" Stamped Face Steel Construction with 1 2" fin spacing for high air flow applications. Screws are included for easy installation White Powder coating with matte finish Individually packed with cardboard box for ultra protection

Actual outside measurement is 14" x 10"

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Screws are included for easy installation

Individually shrink wrapped and packed with card board box for extra protection

Durable Construction: This air supply register is made of sturdy stamped steel for long-lasting use and reliable performance

Size selection guide: 1) take the vent cover off the wall or ceiling

Easy to handle and cut to size using a cutting tool

The Shark Industrial faucet connector features a 1/2-inch FIP x 1/2- inch FIP nut connection

The Listed size 24"x18" is for inside duct opening measurement

and other gas-powered appliances

overall outside dimension is 20

actual outside dimension is 11