FA Exhibit MECH-002

Steiner tunnel and the E2768 extension

Schematic of the Steiner tunnel showing the 10-minute ASTM E84 run and the 30-minute E2768 extension used for ignition-resistant material. — FA Exhibit MECH-002. E84 is a 10-minute tunnel. Oregon ignition-resistant uses an extended run. Not a WUI listing and not noncombustible. After ASTM E84-24 public scope and Oregon R327.2 ignition-resistant definition. Not-to-scale. Illustrative — not a construction document. Verify with your building official. CC BY 4.0.

Technical review: Grayson Graham. Last verified 2026-08-23. JSON

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