Let's see what those who were actually INVOLVED with certifying the steel and construction think. "The buildings should have easily withstood the thermal stress caused by pools of burning jet fuel." - Kevin Ryan Kevin Ryan is Site Manager at Environmental Health Laboratories (EHL) in South Bend, Indiana. This is a division of UL, the product-compliance and testing giant. This is directly from the UL which certified the WTC steel for its ability to withstand fires.