36"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 37.875"W X 13.875"H] ceiling Actual Filter Size – 15

Actual Filter Size – 15 3/4"w x 27 3/4" x 1"

Actual Filter Size – 25 3/4"w x 5 3/4" x 1"

6" x 6" - opening (vent hole - Neck Size) dimension - actual size is approx 2" wider

Actual Filter Size – 27 3/4"w x 35 3/4" x 1"

actual front end outer dimensions are approximately 34 5/8" width X 30 5/8" height

36"W X 12"H [Duct Opening] ALUMINUM RETURN GRILLE - Easy Air Flow - Linear Bar Grilles [Outer Dimensions: 37.875"W X 13.875"H] ceiling Actual Filter Size – 15+ Product Details Size 36"w X 12"h is the size for the duct opening measurement only, actual front end outer dimensions are approximately 37. 875" width X 13. 875" height. High Quality High quality aluminum with counter sunk screw holes (screws included) and no sharp edges. Design Unrestricted airflow For Your HVAC system noise free components no vibrating louvers etc. Powder Coat Finish Smooth, shiny, scratch resistant, beautiful. Looks like it was