Clear Plastic Regal Thermostat Cover - Ring & Solid Bases - 6-3/8" x 3-1/2" Fixed Blades with Damper Actual Filter Size – 33

Actual Filter Size – 33 3/4"w x 17 3/4" x 1"

Its locking eight-tumbler mechanism and supplied key safeguard your thermostat from tampering

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Can be hooked up with our Butterfly Dampersfor precise airflow control

Clear Plastic Regal Thermostat Cover - Ring & Solid Bases - 6-3/8" x 3-1/2" Fixed Blades with Damper Actual Filter Size – 33+ 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