.Buildings.Templates.AirHandlersFans.Types.ReliefReturnSection .Buildings.Templates.AirHandlersFans.Types.ReliefReturnSectiontype ReliefReturnSection = enumeration(NoRelief "No relief branch", NoReturn "No return branch", ReliefDamper "Modulating relief damper without fan", ReliefFan "Relief fan with two-position relief damper", ReturnFan "Return fan with modulating relief damper");