On a recent clean room project for a pharmaceutical manufacturer in Indiana, the customer wanted to use Porta-King’s Versa-King modular wall system, but they didn’t want to have the ledge at each window where dust could collect. The standard arrangement on the Porta-King system has a flush-mounted window on one side, but the other side normally is inset from the wall surface by a couple of inches. Porta-King custom designed a second pane with frame that permitted flush mounted window on both sides of the wall panels, eliminating the ledge where dust could collect. Due to the customer’s stringent cleanliness requirements, both windows were sealed with silicone caulk all around, to assure that no dust could penetrate. As a side note, this customer also required the use of FRP (fiberglass reinforced plastic) wall panel materials on both sides of the panel for durability and cleanability. After three months use, the customer is very happy with the results, and has ordered additional areas built to the same specification.