Fits 8x18 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 9.75"W X 19.75"H (8" W x 18" H Duct Opening) Independent cardboard packing for extra

Independent cardboard packing for extra protection

Built in magnets on each side for easy installation

actual outside dimension is 14" X 14"

SMART DESIGN: Adjustable length of 10"-14" to fit in multiple vent sizes

Fits 8x18 Duct Opening Stamped Steel Return Air Grille Vent Cover Grille for Sidewall and Ceiling in White Surface Dimensions: 9.75"W X 19.75"H (8" W x 18" H Duct Opening) Independent cardboard packing for extraThe Listed size 8"x18" is for inside duct opening measurement, actual outside dimension is 9. 75"x19. 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