12" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Return + Product Details Size –

+ Product Details Size – 6" round duct opening-

Design – removable frame for easy filter change & cleaning - uses a 1" thick filter

+ Product Description Protect and secure your thermostat with this high-quality Clear Plastic Thermostat Guard

Actual Filter Size – 27 3/4"w x 27 3/4" x 1"

+ Product Details Size - 28"w X 14"h is the size for the duct opening measurement only

12" X 10" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling Return + Product Details Size –+ Product Details Size 12"w X 10"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 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