18" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Width_20in + Product Details Size –

+ Product Details Size – 16"w X 28"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 18 5/8" width X 8 5/8" height -

Actual Filter Size – 23 3/4"w x 25 3/4" x 1"

Tough reinforced metallized polyester jacket - tear and puncture resistant

Drop Ceiling HVAC Supply Grille - For T-Bar Lay-In - 3 Coned - 24" x 24" - For 8" Vent Connection - Black

18" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Width_20in + Product Details Size –+ Product Details Size 18"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 14" 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