Panelview with zpurge question

I have a job to retrofit a plc in a hazardous area. The location is classified as Class 1 Div. 2 Group B and D. The enclosure has a purge system in place and I don't plan on any new penetrations other than the hmi cutout.

My questions are about the hmi
1. Is it OK to penetrate the door for the hmi?
2. I can't get an answer from AB about the panelview being exposed to the pressure differential between purge and atmosphere, is this OK?

Ideas, suggestions are welcome.

Thanks,
Jim

yes, it is OK,. We use the PV1000 unit in an explosion proof area.
Make sure that the seals are in place to ensure certification.