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A gas detection alarm shall be initiated where any sensor detects a concentration of gas exceeding the following thresholds:
  1. For flammable gases, a gas concentration exceeding 25 percent of the lower flammability limit (LFL).
  2. For nonflammable gases, a gas concentration exceeding one-half of the IDLH, unless a different threshold is specified by the section of this code requiring a gas detection system.
Upon activation of a gas detection alarm, alarm signals or other required responses shall be as specified by the section of this code requiring a gas detection system. Audible and visible alarm signals associated with a gas detection alarm shall be distinct from fire alarm and carbon monoxide alarm signals.

Related Code Sections

916.8 Fire Protection and Life Safety Systems, System Activation
of the IDLH, unless a different threshold is specified by the section of this code requiring a gas detection system. Upon activation of a gas detection ...