Clear Plastic Regal Thermostat Cover - Ring & Solid Bases - 6-3/8" x 3-1/2" 18" Diameter rotate it to align with

rotate it to align with the square frame

+ Product Details Size – 20"w X 14"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 16 5/8" width X 18 5/8" height

actual front end outer dimensions are approximately 28 5/8" width X 12 5/8" height

Clear Plastic Regal Thermostat Cover - Ring & Solid Bases - 6-3/8" x 3-1/2" 18" Diameter rotate it to align with+ 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