16"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] Flat Elbow Transition˚ A unique combination of cotton

A unique combination of cotton & synthetic fibers gives you the most filtration and the least air resistance - equals great air & easy airflow for your system

Upgrade your system with our high-quality galvanized steel round duct

The operable dampers

Regular Inspection: Periodically inspect the pump for any signs of wear or damage

16"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 17.25"W x 5.25"H] Flat Elbow Transition˚ A unique combination of cotton+ Product Details Size 16"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 17. 25" Width X 5. 25" Height. Design Designed for concealed, flush placement on your wall with a 3 8 inch space between louvers, this linear grille comes with an installation frame and clips for easy hook in assembly, ensuring a refined and seamless look. High Quality Aluminum The premium durable aluminum will never rust and it will never