18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling RV Mobile Home Just run your finger along

Just run your finger along the edge of the top plate and you will find a smooth finished surface

actual front end outer dimensions are approximately 22 5/8" width X 16 5/8" height

Actual Filter Size – 31 3/4"w x 11 3/4" x 1"

order a 20x14 grille

18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling RV Mobile Home Just run your finger along+ Product Details Size 18"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 8" 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