18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Material_Aluminum this thermostat guard is compatible

this thermostat guard is compatible with most standard thermostat models

+ Product Details Size – 26" x 36" or 36" x 26" is the size for the duct opening measurement only

featuring a 8" round duct opening

Locking Security System – Features a built-in eight-tumbler lock and a supplied key to prevent tampering and maintain consistent temperature settings

the decorative Victorian grill

18" x 34" or 34" x 18" Cube Core Eggcrate Return Air Grille Material_Aluminum this thermostat guard is compatible+ Product Details Size 18" x 34" or 34" x 18" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 19. 75" X 35. 75". High Quality High quality, rust free aluminum construction with smooth finished edges and counter sunk screw holes (screws included); no sharp edges.. Installation Location sidewall and ceiling. Design Cubic core eggcrate design Offers highest airflow efficiency at almost 95%, reducing