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Are Door Viewers required by code

My bad. I word searched the 2012 IMPC and this came up. I didn't realize the search had included ICC/ANSI A117.1 2009 which is NOT a referenced standard in the IPMC but is a referenced standard in the IRC R301.1.1, R321.3, 502.1.4. Since none of these are related to any exterior door it's a moot point. No requirement.

R102.4 Referenced codes and standards.
The codes and standards referenced in this code shall be considered part of the requirements of this code to the prescribed extent of each
such reference and as further regulated in Sections R102.4.1 and R102.4.2.
 
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