what finish is most durable for corrisive environments

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Von Duprin Exit Devices (33A/35A, 98/99, etc) are handled on a case by case basis regarding their ability to handle salt and chemical environments. Our powder coated finishes US28 (Anodized Alum...
The 99 and 33A have  grooved mechanism case and cover plates and the 98 an 35A have smooth mechanism case and cover plates.  There is no difference in durability between a 98 and a 99 exit devices.