18" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w10h10 Total outer size of this

Total outer size of this grille is

Actual Filter Size – 11 3/4"w x 25 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 16 5/8" height

+ Product Details Size - 34"w X 28"h is the size for the duct opening measurement only

while the included installation screws make setup quick and hassle-free

18" X 4" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling w10h10 Total outer size of this+ Product Details Size 18"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 6" 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