A troffer is a rectangular light fixture that fits into a modular dropped ceiling grid (i.e. 2′ by 2′ or 2′ by 4′).Troffer fixtures have typically been designed to accommodate standard fluorescent lamps (T12, T8, or T5), but are now often designed with integral LED sources.
The troffer is the most common type of light fixture for use in commercial office spaces, schools, and lab facilities.
Crest Lighting offers many different kinds of Troffers.
See some of them here.