Clear Plastic Classic Thermostat Cover- Solid and Ring Bases- 5-1/4"-4-3/8" Compatible With Duct 8in actual front end outer dimensions

actual front end outer dimensions are approximately 11

this easy-to-install grille fits seamlessly into any standard return filter opening

actual front end outer dimensions are approximately 16 5/8" width X 22 5/8" height

Actual Filter Size – 31 3/4"w x 27 3/4" x 1"

+ Product Details Size – 14" X 4" is the size for the duct opening (floor/vent hole) measurement only

Clear Plastic Classic Thermostat Cover- Solid and Ring Bases- 5-1/4"-4-3/8" Compatible With Duct 8in actual front end outer dimensions+ 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