Clear Plastic Thermostat Guard - See Thru - Solid Base - 8.25" x 5.37" - Extra Large - With Lock & Key steel + Product Details Size -

+ Product Details Size - 20"w X 32"h is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 19 3/4" x 1"

Design – Fixed hinged for easy filter change & cleaning - uses a 1" thick filter

actual front end outer dimensions are approximately 18 5/8" width X 14 5/8" height -

Clear Plastic Thermostat Guard - See Thru - Solid Base - 8.25" x 5.37" - Extra Large - With Lock & Key steel + Product Details Size -+ Product Details Universal Fit Accommodates almost any thermostat with dimensions of 8 1 4" H x 5 3 8" W x 3 1 2" D. Durable Construction Made from high quality, high impact clear plastic for long lasting performance. Locking Security System Features a built in eight tumbler lock and a supplied key to prevent tampering and maintain consistent temperature settings. Easy Installation Comes with all necessary installation screws for a quick and hassle