20 X 40 X 4 Square J Channel Louvered Custom Exhaust Vent

 20 X 40 X 4 Square J Channel Louvered Custom Exhaust Vent

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Working with a common 4 inch deep vent gives a choice of where the flange will be located. This J channel was not set on the face or the back. There is a full 3 1/2" of vent wall to work with. Shop Square louvered custom exhaust vents At 20 x 40 inches on the vent face, the louvers are set at 2 inches apart.

This gives almost no air restriction. The face of the vent is trimmed neatly with an inch border. Then the J channel is added and recessed adding another inch of trim. The J channel trim face will cover the siding edges.