The entire filing cabinet has a double wall construction with a fire resisting compound in-between. The sheet metal thickness has been maintained to a minimum to minimize the condition of heat and has been substantially reinforced at vital places to withstand impact. Each drawer is housed in separate fire resisting compartments.
Poured cement insulating material forms a monolithic barrier and does not powder, flake or break.
Reference: http://steelrange.com/fire-resistant-cabinets.html
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