Leaking Gas - Even If It Becomes Too Rich A Mixture To Ignite With Air - Can Displace The Oxygen Inside Voids Or In Below-grade Areas - ____________ Victims And Firefighters Inside Confined Spaces.

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1. Leaking Gas - Even If It Becomes Too Rich A Mixture To Ignite With Air - Can Displace The Oxygen Inside Voids Or In Below-grade Areas - ____________ Victims And Firefighters Inside Confined Spaces.