Clear Plastic Designer Thermostat Cover- Solid and Ring Bases - 7-1/16" W x 4-1/8" H x2 1/8"D Return Grille + Product Details Size -

+ Product Details Size - 20"w X 20"h is the size for the duct opening measurement only

actual front end outer dimensions are 9

actual front end outer dimensions are approximately 26 5/8" width X 22 5/8" height

Insulation – A thick blanket of fiberglass insulation provides you with an R-Value of 4

+ Product Details Size - 10"w X 20"h is the size for the duct opening measurement only

Clear Plastic Designer Thermostat Cover- Solid and Ring Bases - 7-1/16" W x 4-1/8" H x2 1/8"D Return Grille + 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