Use the Flat or Pitched Ceiling Trim Collar on flat or sloped ceilings whether you install (1) a Round Ceiling Support, (2) use a 36" Finishing cover over Class A pipe on a roof supported installation, or (3) have exposed Class A chimney pipe on a roof supported installation. We offer an outstanding selection of trim collars for your installation - a solution for every installation scenario. Fabricated in two pieces that will screw together in installation - perfect for new or existing installations.