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Minnesota OSHA Indoor Ventilation and Temperature Rule (5205.0110) — Heat Stress Work/Rest Limits

Minnesota OSHA indoor ventilation and temperature rule (5205.0110). Sets WBGT limits for acclimatized workers by workload category. When limits are exceeded, mandatory 30/30 work/rest cycles and airflow/cooling controls are required.

Open Minnesota OSHA Indoor Ventilation and Temperature Rule (5205.0110) in the interactive Guidance Wiki →

Authority

Minnesota OSHA

Jurisdiction

Minnesota State Us

Legal status

Regulation

Rule type

Schedule Engine

Standard ID

HGC-059

Governing formula

No standalone formula is published for this standard; see programmable logic and parameters below.

Work/rest limits

WBGT (°C)	Light 180 W	Moderate 300 W	Heavy 415 W	Very heavy 520 W
24	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr
25	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr
26	60 / 0 min work/rest per hr	60 / 0 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
27	60 / 0 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
28	60 / 0 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
29	60 / 0 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
30	60 / 0 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
31	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
32	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
33	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
34	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
35	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr
36	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr	30 / 30 min work/rest per hr

This standard's declared inputs do not include acclimatization status, so results do not vary by it.

Inputs

Required inputs: wbgtC, workload

Optional inputs: none

Sources

• 🇺🇸 Minnesota OSHA Indoor Ventilation and Temperature Rule (5205.0110) — Minnesota OSHA (official regulation)

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