The device center case is 8" tall, 2-¾" wide, and has a projection of 2-3/8"
The push pad is 18" for a 3' device, and 24" for a 4' device.
The channel assembly is 2-¼" tall and has a projection of 2-¼" as well.
Overall projection is 3-13/16" with the push pad extended and 3-1/16" with the push pad depressed.
There is a diagram on page 70 of the 7/22 revision of the Von Duprin 98-99 Series exit devices catalog (allegion.com).
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