The limitations and capabilities of the respirator would cover how the
respirator operates. This includes an explanation of how the respirator provides protection by filtering the air, absorbing the vapor, or providing clean air from an uncontaminated source. Where appropriate, it should also include limitations on the equipment such as prohibitions against using air-purifying respirators in case of an emergency in IDLH atmosphere, and an explanation of why they should not be used in such situations.