Weather-resistant and storm-resistant formed metal louvers are available in numerous metals, gauges and depths. Metals available include galvanized steel, stainless steel / copper (square or rectangle shapes only) or aluminum. We recommend that frames and blades be 16-gauge, 18-gauge or 20-gauge material. Standard fabrication is in galvanized steel with all-welded assembly. Most of the designs are available in depths of 2" to 12".