Clear Plastic Thermostat Guard - See Thru - Solid Base - 8.25" x 5.37" - Extra Large - With Lock & Key 12" Diameter actual front end outer dimensions

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

Our coils have a very high PSI burst pressure

this air vent diffuser is built to last

the gap will expand and retract to meet perfect air supply needed

Seamless Installation: Designed to fit seamlessly into a 24 by 24 inch opening

Clear Plastic Thermostat Guard - See Thru - Solid Base - 8.25" x 5.37" - Extra Large - With Lock & Key 12" Diameter actual front end outer dimensions+ 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