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Reference.org
Collapse zone
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<p>A collapse zone is an area around a <a href="/facts/Structure/xQDPtqDQ">structure</a>, usually a <a href="/facts/Structure_fire/VjaYwLHj">burning structure</a>, that may suffer <a href="/facts/Structural_collapse/5aYoMIlw">structural collapse</a>. A collapse zone affects <a href="/facts/Firefighter/483TlnYB">firefighters</a> working on the exterior of a structure. </p>