Beige Metal Thermostat Guard with Ring Base - Durable Tamper-Proof Cover, 6" x 3-13/16" 14in diameter + Product Details Size -

+ Product Details Size - 28"w X 12"h is the size for the duct opening measurement only

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Total outer size of this grille is

from 4" to 20"

Actual Filter Size – 35 3/4"w x 31 3/4" x 1"

Beige Metal Thermostat Guard with Ring Base - Durable Tamper-Proof Cover, 6" x 3-13/16" 14in diameter + Product Details Size -+ Product Details Heavy Duty Steel Construction Made from 20 gauge steel for superior durability and reliable performance. Ring Base Design Allows for easy installation without removing the thermostat, providing maximum flexibility. Tamper Proof Security Features a robust design to prevent unauthorized access and protect your thermostat settings. Built In Locking System Comes with a permanently attached eight tumbler lock and a supplied key for added