20" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 8" Round Duct Pipe Actual Filter Size – 17

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

+ Product Details Size - 28"w X 22"h is the size for the duct opening measurement only

Tamper-Proof Security – Features a robust design to prevent unauthorized access and protect your thermostat settings

Both lines taped together every 18in for easier handling & installation

20" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling 8" Round Duct Pipe Actual Filter Size – 17+ Product Details Size 20"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 12" 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