6" X 6" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 7.75"W X 7.75"H] Outdoor Vent Covers Installation – Easy to Install

Installation – Easy to Install

+ Product Details Size – 8" x 20" or 20" x 8" is the size for the duct opening measurement only

Actual Filter Size – 9 3/4"w x 33 3/4" x 1"

Design – Unrestricted airflow for your HVAC system - adjustable one-way louver with full horizontal airflow directional control - single deflection supply grill with 96% airflow - noise free components - no vibrating louvers etc

+ Product Details Size – 18"w X 16"h is the size for the duct opening measurement only

6" X 6" [Duct Opening] 1-Way Air Vent Adjustable Aluminum Curved Blades Integral Multi-Shutter Damper HVAC Diffuser [Outer Dimensions: 7.75"W X 7.75"H] Outdoor Vent Covers Installation – Easy to Install+ Product Details Size 6"w X 6"h is the size for the duct opening measurement only, actual front end outer dimensions are 7. 75" width X 7. 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