An epitaxial growth processing chamber with a component having a macrocell support structure configured with interconnecting physical supports that define fluidly-connected pores is described. A component configured for use in an epitaxial growth processing chamber having a macrocell support structure configured with interconnecting physical supports that define fluidly-connected pores is also described. The component is a baseplate, an exhaust cap, an injection ring, an injection cap, a lower reflector, an upper reflector, a lower heat shield, an upper heat shield, a cone reflector, or combinations thereof. In some instances, the component may further include an inlet flow port. In some other instances, the component may further include an inlet flow port, outlet flow port and a fluid flow wall, and optionally a fluid flow baffle, and optionally a reflective surface.