12"w X 12"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] 18in diameter Actual Filter Size – 21

Actual Filter Size – 21 3/4"w x 5 3/4" x 1"

actual front end outer dimensions are approximately 30 5/8" width X 38 5/8" height

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

actual front end outer dimensions are approximately 38 5/8" width X 22 5/8" height -

angle them down for effective warmth distribution

12"w X 12"h [Duct Opening] 3-Way Fixed Curved Blade Air Supply Diffuser Register Vent Cover Grille [Outer Dimensions: 13.75"W X 13.75"H] 18in diameter Actual Filter Size – 21+ Product Details Size 12"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" width X 13. 75" height. High Quality High quality steel with counter sunk screw holes (screws included) and no sharp edges. Equipped with a lever for easy airflow adjustment and dampening. Airflow Control Adjustable airflow lever allows precise control over the direction and volume of air. Installation