Fire Rated Troffers:
Debunking the Myth

I need a fire rated troffer!
A true fire rated troffer does not exist because UL does not list troffers as "fire rated". Instead, they list ceiling systems which may include UL listed troffers as part of that system.
But my inspector says I need one!
Your inspector has authority and jurisdiction over your project. However, a better understanding of the fire rated ceiling system process can only help in your discussions.
How do I get a fire rating?
UL publishes a book called the Fire Resistance Directory. It is published each February. A supplement is issued each August. The Fire Resistance Directory contains instructions for fire rated ceiling systems. Each approved ceiling system has a design number. The fire rated ceiling system is achieved by selecting a design number and following instructions, which include spacing criteria, enclosure requirements, etc. When complete, the system carries a fire rating (for example, one hour).
I remember fire rated troffers from jobs past!
Many years ago, UL listed three ceiling designs using a special fire rated troffer. Columbia Lighting (and a few others) offered this troffer, which consisted of a recessed unit with a sheet of fire resistant material attached to the back of it. Since all three ceilings have been obsolete for decades (some exceptions in Canada), Columbia Lighting does not manufacture this troffer anymore. Instead, we manufacture in accordance with UL 1570, which allows our recessed fixtures to be installed in a fire rated ceiling system.
What is a fire rated label?
Columbia Lighting can provide a fire rated label which states that our recessed light fixtures are manufactured in accordance with UL1570 and, therefore, can be installed in a fire rated ceiling system. There are no additional structural requirements. In other words, if you were to order a J24-440G-FSA12-LE120-FRL from the factory and then pull a J24-440G-FSA12-LE120 out of distributor stock, the only difference between the two units would be that one has a label on it and one does not.
Why would I want a fire rated label?
Sometimes local codes or inspectors require this label be affixed to the recessed troffer.