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What power supply to use for a pair of doors with the QEL and ESL in both devices?

The PS904 with two 900-4R boards is required to operate a pair of doors with QEL-ESL devices.

If the doors are fire rated, a 900-FA board is also required on the 900-4R board that is being used to power the QEL devices.

Reference the Von Duprin ESL Kit Installation Instructions 013797 (allegion.com).


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