During a renovation, a server administrator must secure a large interior window that gives visitors in the lobby a direct view of the new server room. Technicians still need to watch the lobby through the glass, but auditors require that passers-by cannot see racks, consoles, or screen data. Which physical access control best satisfies these requirements with the least day-to-day upkeep?
Install one-way reflective glass or apply mirror privacy film with the lobby side brightly lit.
Fit the window with switchable electrochromic (smart) glass that turns opaque when unpowered.
Add low-emissivity tinted glazing that blocks approximately half of visible light.
Replace the pane with UL-rated bullet-resistant laminated safety glass.
One-way reflective ("mirror") glass accomplishes two goals at once: it lets staff inside the darker server room look out, while the brighter lobby side sees only a mirror image. Because visibility is controlled passively by the lighting differential and the reflective coating, no motors, switches, or scheduled actions are needed after installation. The other options either stop forced entry (bullet-resistant laminated glass), rely on powered electrochromic technology that requires ongoing control, or merely reduce brightness with tinting while still allowing equipment to be seen.
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What is one-way reflective glass, and how does it work?
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What is the purpose of UL-rated bullet-resistant laminated safety glass, and why doesn’t it meet the requirements here?
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How does switchable electrochromic (smart) glass work, and why isn’t it ideal here?