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Breathing is an automatic process and a part of our everyday lives, but we don’t think too much about it until we need to. Improper ventilation in a confined space means that workers may breathe in gases and toxins that can cause illness and death. The proper sizing of a blower unit can help you comply with confined space ventilation requirements.When Does Confined Space Ventilation Matter? Confined space ventilation always matters. OSHA's standard for confined spaces (1910.146 Permit Requi …