See page 2 and especially page 3
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MANUFACTURES INSTALLATION SPECIFICATIONS FOR SAFETY
Direct contact between electrically continuous metallic systems and Gastite® yellow CSST is prohibited. Maintain as much isolation/separation as reasonably possible when planning and installing gas piping from other continuous metallic systems. Continuous metallic systems including metallic chimney liners, metallic appliance vents, metallic ducting and piping, and insulated or jacketed electrical wiring and cables.
CSST, should not be installed within a chase or enclosure that houses a metallic chimney liner or appliance vent that protrudes through the roof.