Fittings

In this section all fittings related information needed to satisfy the Exchange HVAC Model - (Systems) will be described.

Owner History

Information Needed	Man	Opt	Rec	Actor Supplying	Functional Part
The owner history of the flow fittings must be asserted.				HVAC Designer	Model Flow Fitting (FP)

General Attributes

Information Needed	Man	Opt	Rec	Actor Supplying	Functional Part
General attributes of the fitting types and occurrences may be specified including:
name to extend identification of the type or occurrence				HVAC Designer	Model Flow Fitting (FP)
description that can be used for any further qualifying information				HVAC Designer	Model Flow Fitting (FP)

Placement and Shape

Note that since IFC generally allows for elements to have multiple shape representations, provision of shape representations of ductwork systems at different lifecycle stages should be considered as cumulative and not as alternative.

Information Needed	Man	Opt	Rec	Actor Supplying	Functional Part
Where information about fitting shape is to be exchanged as part of the building model specification, the placement and shape representation should be asserted. The shape representation of a duct fitting is typically a representation map which is defined for the fitting type and then referenced for each occurrence. Each occurrence specifies its own placement. Within the representation map, the particular form of the shape representation may differ according to the life cycle stage as with flow segments. Generally, the representations selected for the flow fitting representation map will follow the representations selected for flow segments being either: Axis Representation Body Representation Swept solid CSG Bounding box Boundary representation (Brep)				HVAC Designer	Model Flow Fitting (FP)

Properties

Specification of properties that may be assigned through property sets as defined in the functional part. For flow fittings, properties will generally be defined for the fitting type. Properties specified may include:

Information Needed	Man	Opt	Rec	Actor Supplying	Functional Part
Subtype of fitting (i.e., 5-gore, pleated, stamped, etc.) May be considered to be optional in earlier design stages but is recommended for inclusion at coordinated design stage.				HVAC Designer	Model Flow Fitting (FP)
Material from which the duct fitting is constructed				HVAC Designer	Model Flow Fitting (FP)
The thickness of the duct fitting material				HVAC Designer	Model Flow Fitting (FP)
Pressure classification as defined by the authority having jurisdiction (e.g., DW144, SMACNA, etc.)				HVAC Designer	Model Flow Fitting (FP)
Weight per unit length.				HVAC Designer	Model Flow Fitting (FP)
Allowable maximum and minimum working pressure (relative to ambient pressure). May be considered to be optional in earlier design stages but is recommended for inclusion at coordinated design stage.				HVAC Designer	Model Flow Fitting (FP)
Allowable maximum and minimum temperature. May be considered to be optional in earlier design stages but is recommended for inclusion at coordinated design stage.				HVAC Designer	Model Flow Fitting (FP)
The nominal width or diameter (if circular) of a duct fitting or, in the case of a circular cross section, the diameter.				HVAC Designer	Model Flow Fitting (FP)
The nominal height of the fitting (omitted if the duct fitting is circular).				HVAC Designer	Model Flow Fitting (FP)
The end-style treatment of the duct segment manufactured.				HVAC Designer	Model Flow Fitting (FP)