14" X 4" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 15.75"W X 5.75"H] return grille at predicted low air motion

at predicted low air motion 35 fpm in the zone of occupancy

+ Product Details Size – 12" x 30" or 30" x 12" is the size for the duct opening measurement only

Actual Filter Size – 24 3/4"w x 33 3/4" x 1"

75" width X 19

+ Product Details Size – 22"w X 25"h is the size for the duct opening measurement only

14" X 4" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 15.75"W X 5.75"H] return grille at predicted low air motion+ Product Details Size 14"w X 4"h is the size for the duct opening measurement only, actual front end outer dimensions are 15. 75" width X 5. 75" height. Design Individually adjusting curved blades. Multi shutter damper with handle operator to adjust air flow. Screws Included High Quality Aluminum The premium durable aluminum will never rust and it will never wear through leaving the material with an elegant, beautiful, and smooth surface, adds a