36"W X 4"H [Duct Opening] Linear Aluminum Clip-On Bar Return Air Grille [Outer Dimensions: 37.25"W x 5.25"H] Flexible Ducts + Product Details Outer dimensions:

+ Product Details Outer dimensions: 13

actual front end outer dimensions are approximately 22 5/8" width X 12 5/8" height -

our access door offers high durability with superior corrosion and rust protection

+ Product Details Size - 18"w X 6"h is the size for the duct opening measurement only

Pressure Rating: 2100 to 7000 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] Flexible Ducts + Product Details Outer dimensions:+ 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