Revit 2026 API

Autodesk.Revit.DB.Mechanical Namespace

Classes

	Class	Description
	AirSystemData	Represents the data and parameter of analytical air system.
	Duct	A duct in the Autodesk Revit MEP product.
	DuctFittingAndAccessoryConnectorData	The input data used by external servers for calculation of the duct fitting and duct accessory coefficient.
	DuctFittingAndAccessoryData	The input data used by external servers for calculation of the duct fitting and duct accessory coefficient.
	DuctFittingAndAccessoryPressureDropData	The input and output data used by external servers for calculation of the duct fitting and duct accessory pressure drop.
	DuctFittingAndAccessoryPressureDropItem	A flow path of the duct/pipe fitting and accessory. It is defined by the begin connector and end connector.
	DuctInsulation	Represents insulation applied to the outside of a given duct , fitting or accessory.
	DuctInsulationType	This class represents a duct insulation type in Autodesk Revit.
	DuctLining	Represents Lining applied to the inside of a given duct, fitting or accessory.
	DuctLiningType	This class represents a duct lining type in Autodesk Revit.
	DuctPressureDropData	The input and output data used by external servers for calculation of the duct pressure drop.
	DuctSettings	The duct setting class.
	DuctSizeIterator	An iterator to a set of MEP duct sizes from DuctSizes.
	DuctSizes	Class RbsDuctSizes being used to store the duct sizes
	DuctSizeSettingIterator	An iterator to a set of items from DuctSizeSettings. Each item is a KeyValuePair(DuctShape::Enum, DuctSizes).
	DuctSizeSettings	Duct sizes settings
	DuctType	A duct type element.
	FlexDuct	A flex duct in the Autodesk Revit MEP product.
	FlexDuctType	A flex duct type in the Autodesk Revit MEP product.
	MechanicalEquipment	Provides access to the Mechanical Equipment in Autodesk Revit MEP.
	MechanicalEquipmentSet	A set of interrelated mechanical equipment in a MEP system that works together.
	MechanicalEquipmentSetType	Represents a type for a set of interrelated mechanical equipment in a MEP system that works together.
	MechanicalFitting	A mechanical fitting in the Autodesk Revit MEP product.
	MechanicalSystem	A mechanical system element.
	MechanicalSystemType	Base class for duct system types
	MechanicalUtils	General utility methods in the Autodesk Revit MEP product.
	MEPAnalyticalSystem	Represents an analytical system where the air or water is circulated to satisfy building energy requirements.
	MEPBuildingConstruction	Construction definition for Project Information.
	MEPBuildingConstructionSet	A set that contains MEPBuildingConstructions.
	MEPBuildingConstructionSetIterator	An iterator to a MEPBuildingConstruction set.
	MEPHiddenLineSettings	Represents the settings contained in the document associated to the MEP hidden line display.
	MEPSection	A section in the Autodesk Revit MEP product.
	MEPSpaceConstruction	Construction definition for Space.
	Space	Provides access to the space topology in Autodesk Revit.
	SpaceFilter	A filter used to match spaces.
	SpaceSet	A set that can contain any type of object.
	SpaceSetIterator	An iterator to a set.
	SpaceTag	Provides access to the space tag in Autodesk Revit.
	SpaceTagFilter	A filter used to match space tags.
	SpaceTagType	An object that represents a Space Tag style.
	SystemZoneData	Represents the specific domain requirements for a system-zone used in MEP design.
	SystemZoneElementType	Represents an element type for a system-zone element.
	WaterLoopData	Represents the data and parameters of analytical water loop.
	Zone	A zone is a collection of one or more spaces.
	ZoneElementDomainData	A base class for specific domain requirements for a zone.
	ZoneEquipment	Represents an early-stage equipment placeholder that provides heating or cooling to part of air system or water loop.
	ZoneEquipmentData	Represents the data and parameters of analytical zone equipment.

Interfaces

	Interface	Description
	IDuctFittingAndAccessoryPressureDropServer	Interface class for external servers implementing duct fitting and duct accessory coefficient calculation.
	IDuctPressureDropServer	Interface for external servers implementing duct pressure drop calculation.

Enumerations

	Enumeration	Description
	AirCoolingCoilType	The type of air cooling coil.
	AirFanType	The type of air fan.
	AirHeatExchangerType	The type of air loop.
	AirHeatingCoilType	The type of air heating coil.
	AnalyticalSystemDomain	The domain type of analytical system.
	ComponentClassification	An enumerated type lists all MEP component classification. This attribute describes the general purpose of the MEP part component, that is used for scheduling, tagging, filter, ODBC, and etc. One component classification may include more than one part type.
	ConditionType	An enumerated type listing all the possible condition types for a space object.
	DuctFlowConfigurationType	An enumerated type listing all duct flow configuration types for a connector.
	DuctLossMethodType	An enumerated type listing all duct loss calculation methods for a connector.
	DuctShape	Enumerated type listing possible shapes for ducts.
	DuctSystemType	An enumerated type listing all the possible duct system types for a connector object.
	EquipmentClassification	This enumeration is used to classify the mechanical equipment.
	OccupancyUnit	An enumerated type listing the occupancy unit of measure for a space object.
	ReturnAirflowType	An enumerated type listing all the possible return airflow types for a space object.
	RiseDropSymbol	This enumeration corresponds to the rise/drop symbol used in mechanical systems
	SpaceType	An enumerated type listing all the possible space types for a space object.
	SystemCalculationLevel	Enumerated type listing flags that can toggle on or off certain calculations related to MEP systems.
	WaterChillerType	The type of water chiller.
	WaterLoopType	The type of water loop.
	ZoneEquipmentBehavior	The behavior of zone equipment associated with spaces.
	ZoneEquipmentHvacType	The type of zone equipment.

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