36" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Color_Black actual front end outer dimensions

actual front end outer dimensions are approximately 16 5/8" width X 30 5/8" height

And The Cooler Air From Outside WIll Flow In From The Bottom

designed to optimize your air distribution

This grille is ideal for both sidewall and ceiling installations

and Diffusers

36" X 12" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Color_Black actual front end outer dimensions+ Product Details Size 36"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 37. 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