Troffers are commonly used in commercial buildings like office spaces, schools, hospitals, retail stores, etc. Some key places where troffers are typically used include: Suspended ceilings in offices, school classrooms, retail store lighting, hospital and medical lighting, warehouse and garage lighting, conference rooms and meeting areas, aisles and corridors in commercial buildings. In summary, any commercial interior application with a dropped or suspended ceiling is a good candidate for troffer lighting fixtures.