How do I tell if my filing cabinet is fireproof?

1960s General Fireproofing "Modemaker" single-pedestal tanker desk, newly refurbished with a gloss white (WH 12) powder-coat. The desktop has a lowered section (which was originally ...

Architectural design, commercial quality swivel, tilt desk, office chair by Good Form, General Fireproofing. This example has a four leg aluminum base, with vinyl upholstered seat an...

Desk by General Fireproofing with eight drawers. Comes with glass top. Good condition with some normal wear.

This is a 40/4 Side Chair, initially designed by David Rowland in 1964. This particular chair dates to 1979. This iconic form has been praised as one of the most ingenious modern designs of the 20th century, and has been credited for being the first truly stackable chair. This example is important as it was formerly utilized in Skidmore, Owings, and Merrill's Chase Manhattan Bank project. The chair maintains its original tags. SOM was the firm that originally helped to make the 40/4 chair a viable product. They ordered 17,000 of them for UIC Chicago, which helped Roland and the product thrive afterward. The chair has a solid steel sled base, and has a black plastic seat and back. This example was manufactured by GF Business Equipment...

Classic Industrial, Mid Century, Machine Age style drafting stool by General Fireproofing, Good Form. The stool has a squared aluminum frame structure, vinyl seat and back rest. It ...

This is a single (multiple chairs are available, though the price listed is for each chair) 40/4 chair, originally designed by David Rowland in 1964. This iconic chair has been praised as one of the most ingenious modern designs of the 20th century, and has been credited for being the first truly stackable chair. Each chair has a solid steel sled base, and has a red enameled steel seat. These particular examples were manufactured by GF Business Equipment (part of General Fireproofing Co...