Clear Plastic Classic Thermostat Cover- Solid and Ring Bases- 5-1/4"-4-3/8" 12" Diameter + Product Details Size -

+ Product Details Size - 14"w X 12"h is the size for the duct opening measurement only

Actual Filter Size – 27 3/4"w x 23 3/4" x 1"

75" Width X 17

actual front end outer dimensions are approximately 12 5/8" width X 22 5/8" height -

Clear Plastic Classic Thermostat Cover- Solid and Ring Bases- 5-1/4"-4-3/8" 12" Diameter + Product Details Size -+ Product Details Durable Construction Made with clear, high impact plastic to provide reliable and long lasting protection for your thermostat. Two Mounting Base Options Includes both a solid base and a ring base. The ring base allows installation without removing the thermostat, offering maximum flexibility. Locking Security System Features a built in eight tumbler lock and a supplied key to prevent tampering and maintain consistent temperature