18" X 16" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling sidewall actual front end outer dimensions

actual front end outer dimensions are approximately 26 5/8" width X 38 5/8" height -

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including the ability to mount without removing the thermostat when using the ring base

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

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18" X 16" ADJUSTABLE AIR SUPPLY DIFFUSER - HVAC Vent Duct Cover Sidewall or Ceiling sidewall actual front end outer dimensions+ Product Details Size 18"w X 16"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 875" width X 18" 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