36"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 37.25"W x 5.25"H] Compatible With Duct 4in + Product Details Size –

+ Product Details Size – 12" x 20" or 20" x 12" is the size for the duct opening measurement only

Applications – The snap on system makes for easy installation and will prevent the seam from coming apart while also preventing air leakage making your HVAC system more energy efficient and in turn

It comes with two versatile mounting base options—solid and ring—making installation simple and flexible

Solid Base Construction – Features a solid base for stable installation and reliable protection

3/8" - 4223 PSI

36"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 37.25"W x 5.25"H] Compatible With Duct 4in + Product Details Size –+ Product Details Size 36"W X 4"H is (for duct opening measurement only); actual front end outer dimensions are 37. 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