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+ Product Details Size - 4"w X 18"h is the size for the duct opening measurement only
Check Out This Asin For Matching T-Bar Drop-Ceiling Grille: B007CNEJZK
+ Product Details Size - 4"w X 28"h is the size for the duct opening measurement only
Heavy-gauge all-steel construction
14" x 36" or 36" x 14" Cube Core Eggcrate Return Air Grille Filter Grille accordion-header h2+ Product Details Size 14" x 36" or 36" x 14" is the size for the duct opening measurement only, actual front end outer dimensions are approximately 15. 75" X 37. 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