12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille 14" Round Duct Pipe accordion dd { margin: 0

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Filter grille features a user-friendly plastic latch that requires no screwdriver for opening

Actual Filter Size – 27 3/4"w x 11 3/4" x 1"

actual front end outer dimensions are approximately 20 5/8" width X 14 5/8" height

+ 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

12" x 18" or 18" x 12" Cube Core Eggcrate Return Air Grille 14" Round Duct Pipe accordion dd { margin: 0+ Product Details Size 12" x 18" or 18" x 12" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 13. 75" X 19. 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