18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Aluminum Bar It has an outer surface

It has an outer surface made of high-quality aluminum foil and an inner surface made of metalized PET with inside high-tensile spring steel wire

our grill boasts an impressive 96% airflow capacity

providing a stylish and practical solution for ventilation

+ Product Details Size – 40"w X 20"h is the size for the duct opening measurement only

18" X 6" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Aluminum Bar It has an outer surface+ 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