Who makes physical security & access for AI data centers

This layer covers the security systems installed alongside the building's electrical and mechanical infrastructure: badge and biometric access control, video management systems, mantraps and turnstiles that enforce single-person entry to data halls, perimeter intrusion detection around the site boundary, and the guarding services that staff it. It's a cross-cutting layer that touches the building envelope (9.06), the fencing and site perimeter, and the operational procedures of the tenants in 9.01 and 9.02. Security requirements at hyperscale and AI-campus facilities are typically driven by tenant-specific compliance regimes rather than by AI workloads themselves, so this category hasn't seen the same demand reshaping visible elsewhere in the taxonomy — the main effect of the AI buildout here is simply more sites needing a full security stack, at a pace investors should expect to track overall data center construction volume rather than any distinct density-driven dynamic.