HVAC systems include electrical isolator switches that can cut power to fans and motors; these isolators must be switched off before entering or working on an AHU because rotating fans can cause serious injury (loss of arm or finger).
normativepending
Evidence Quote
“It's obviously important to switch off any fan. That's inside here first Cut the power because it's obviously very dangerous and you might get sucked in and potentially lose an arm or a finger or something”
Created: 8/13/2026, 4:57:53 AM
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