The opening of the top drawer makes the rest of the drawers open in the state of unlocked keys. Each drawer is also provided with its own ” flip lever ” at its side. When set in the release position, the particular drawer will freely open even though the other drawers are locked. The units are constructed from special new formula insulation materials that provide excellent fire resistance. A tung and groove construction prevents the heat from conducting to the inside of drawers. Each individual drawer compartment is constructed separately to provide independent refractory effect against fire.