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) It has built-in damper to

It has built-in damper to control air flow

harsh weather

The high weight and flexible HDPE Inner core makes installation and handling super easy

• Quick Disconnect Fitting for fast and convenient connection

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) It has built-in damper toThe 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