The external service which permits registration of an alternate implementation for duct pressure drop calculation. To use this service, programmers implement a server class that derives from IDuctPressureDropServer.

public static ExternalServiceId DuctPressureDropService { get; }

Public Shared ReadOnly Property DuctPressureDropService As ExternalServiceId
	Get

public:
static property ExternalServiceId^ DuctPressureDropService {
	ExternalServiceId^ get ();
}