Designed for both wall and ceiling applications
actual front end outer dimensions are approximately 27 5/8" width X 28 5/8" height
Total outer size of this grille is
+ Product Details Size - 26"w X 30"h is the size for the duct opening measurement only
Designed for optimum performance
18" X 8" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Color_R-4.2 Yellow Designed for both wall and+ Product Details Size 18"w X 8"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 10" height. High Quality High quality steel construction, no scuff powder coat durable finish, smooth, shiny, scratch resistant, no sharp edges, 2 recessed screw holes on each side with screws included, screws same color as vent cover, easy installation. Adjustable airflow control Adjustable airflow