18" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling rg1010 Actual Filter Size – 29

Actual Filter Size – 29 3/4"w x 5 3/4" x 1"

75" width X 3

Actual Filter Size – 17 3/4"w x 7 3/4" x 1"

5" - SEE BELOW IN DESCRIPTION How To Measure A Grille

The integrated eight-tumbler lock system

18" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling rg1010 Actual Filter Size – 29+ 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