State Regulations10 min readJanuary 2026

Cal/OSHA 3396: California's New Indoor Heat Illness Prevention Standard

It is not just for outdoor workers anymore. Learn about the new Section 3396 for indoor workspaces like warehouses and kitchens.

Indoor Heat is Now Regulated

California recently adopted Section 3396, targeting indoor work areas where the temperature equals or exceeds 82°F.

Key Differences from 3395

  • Trigger: 82°F indoor temperature.
  • Measurement: Must use WBGT devices if high radiant heat is present? (Clarify simplified compliance vs complex)
  • Cool-Down Areas: Must be maintained below 82°F.

Warehouses, manufacturing plants, and restaurant kitchens are the main targets.

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