The standard WBGT flag ladder (Green at 80°F, Yellow at 85, Red at 88, Black at 90) assumes moderate work by heat-acclimatized people in regular work clothes. When the work is harder, the crew is new to the heat, or the clothing traps more of it, the same room becomes dangerous at a lower reading. ACGIH publishes exactly how much lower — an occupational limit per workload for acclimatized and unacclimatized workers, and a clothing adjustment added to the measured WBGT — and OSHA reproduces those numbers in its heat-hazard guidance.
The Heat exposure baseline page asks three questions — how hard is the work (with OSHA's own examples), is the workforce acclimatized (OSHA: assume not, for anyone on the job under 1–2 weeks), and what do they wear — and derives one number: how many °F your thresholds tighten. Every band moves down by that amount, on the unit's own screen and in every alert, chart and report. A review step shows the exact before-and-after table before anything is saved, and every change lands in the activity log.
- Unconfigured means untouched: until someone answers the questions, the fleet stays on the standard ladder.
- Adjustments only ever tighten. The published table would let light, acclimatized work loosen thresholds — this product never goes looser than the standard ladder.
- Stores and single units can override the organization baseline — ten units in one distribution center can flag at different levels where the work or the clothing genuinely differs, and each adjusted unit is labelled so two neighbours flagging differently reads as configuration, not a fault.
- Vapor-barrier and encapsulating suits are not offered: that work is beyond a screening tool and needs a qualified heat-stress assessment.