Best Recommendations For Recessed Alarm Sensors?

Looking for ideas/best practices/pitfalls on putting contact sensors on 130 operable windows in a commercial building. Picture an "L" shaped building, 3 floors, 33K sq feet per floor. Each window is 2'x2'. Aluminum store front with a crank handle. Each floor has 2 IDF or Network Closets.

The owner is a fresh air nut. Enough said.

I assume that hardwire is preferred method, drop a zone expander in each IDF???

For aesthetics they would like concealed sensors - any recommendations for storefront aluminum?

Thanks in advance.

NOTICE: This comment has been segmented into a related discussion: Recommendation For Small Access Control System With Integrated Intrusion Alarm?

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