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A fire research hall with the two rivals side by side: the long horizontal steel duct of an ASTM E84 Steiner tunnel with small flames glowing behind its round observation windows, next to a full-scale ISO 9705 room corner test with flames rising from the corner burner and smoke pouring into a stainless-steel exhaust hood.

📊 Fire Testing July 10, 2026 · 15 min read

ASTM E84 vs ISO 9705: Why Fire Tests Disagree on Walls

How the ASTM E84 Steiner Tunnel and the ISO 9705 room corner test can rate the same wall lining Class A and a flashover hazard, and which to trust.