Case study · Hotel / Hospitality
Failing benchmark to first-pass AHJ approval
AC Hotel Ann Arbor, a 7-floor hotel in Ann Arbor, Michigan, failed its public-safety benchmark grid test — legally triggering an ERCES. WZC took it to full code coverage, approved on the first inspection.
- First-pass AHJ approval
- 7-floor hotel · 81,706 sq ft
- Zero punchlist items
Engineered to pass the first inspection
Benchmark: failed grid test — Acceptance: first-pass approval
When AC Hotel Ann Arbor failed its public-safety benchmark grid test, the failure legally triggered an ERCES requirement. WZC ran the full process from there: predictive iBwave design and direct fire-marshal coordination, so the system on paper was the system the AHJ expected to see.
The installed system is a COMBA CriticalPoint Class A BDA feeding 54 ceiling dome antennas across 81,706 sq ft, backed by a 33.9-hour LiFePO4 battery system.
The acceptance grid test proved 95% general and 99% critical-area coverage with margin — earning first-pass AHJ approval with zero punchlist items.
54
Ceiling dome antennas
81,706
Sq ft covered
95%
General coverage
99%
Critical-area coverage
33.9 hr
Battery backup
0
Punchlist items
- Predictive iBwave design with fire-marshal coordination
- COMBA CriticalPoint Class A BDA, 54 ceiling dome antennas
- 33.9-hour LiFePO4 battery backup system
- Acceptance grid test passed with margin — zero punchlist
From failed benchmark to margin above code
Acceptance grid-test results at AC Hotel Ann Arbor — 95% general and 99% critical-area coverage across 81,706 sq ft, approved on the first inspection.
- IFC 510 general minimum: 95%
- IFC 510 critical minimum: 99%
- Benchmark grid test: FAIL — below code, ERCES triggered
- Acceptance — general areas: 95%
- Acceptance — critical areas: 99%
- First-pass AHJ approval · 0 punchlist items · 54 dome antennas · 33.9-hr battery backup
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