Ventilation failure events - where mechanical systems fail in intensive poultry houses - can kill thousands or even hundreds of thousands of birds within hours through heat stress. They represent a catastrophic welfare risk in industrial poultry production.
Ventilation failure deaths represent deaths by hyperthermia - a painful process involving distress, organ failure, and suffering that may last hours for birds trapped in failing systems. The scale of individual events - hundreds of thousands of birds in a single incident - makes this a significant welfare concern that is largely invisible in production statistics. The industry's categorization of these deaths as 'natural mortality' within acceptable loss percentages obscures the welfare reality. Mandatory emergency backup power, multi-redundant alarm systems, and automatic emergency ventilation are technically achievable but not universally required.