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Why is the 388NL cylinder assembly required with the Von Duprin 33A/35A Series exit devices for NL-OP applications?

This application requires the use of a rim cylinder, and an ordinary rim cylinder anchor plate would interfere with the components on the back of the exit device center case. The 388NL provides an alternate means of mounting the rim cylinder.  In addition, the 388NL shims the rim cylinder body away from the door so the back of the cylinder does not interfere with the back of the exit device center case.

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