Clear Plastic Regal Thermostat Cover - Ring & Solid Bases - 6-3/8" x 3-1/2" Width_20in + Product Details Size -

+ Product Details Size - 16"w X 34"h is the size for the duct opening measurement only

+ Product Details Size – 16"w X 20"h is the size for the duct opening measurement only

+ Product Details Size – 10"w X 2"h is the size for the duct opening measurement only

+ Product Details Size – 6"w X 10"h is the size for the duct opening measurement only

actual front end outer dimensions are approximately 32 5/8" width X 8 5/8" height -

Clear Plastic Regal Thermostat Cover - Ring & Solid Bases - 6-3/8" x 3-1/2" Width_20in + 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