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How does a viewer extension affect the door thickness range for that viewer?

Ives does offer extensions for their viewers to allow a viewer to be used on thicker doors.
 
The U696, 700, U700, 701, and U701 viewers use part 890314626.
The 698 and U698 viewers use part 8901313626.
 
Adding one extension to a viewer adds 1 1/16" to the minimum and 9/16" to the maximum door thickness for that viewer.

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