Fitting Function

Geometry

Category

Sequential NumberSSupply

DRound (dia)

1Entries

1, 2, 3 nEExhaust/Return

RRectangular

2Exits

CCommon

OOval

3Elbows

4Transitions

5Junctions

6Obstructions

7Fan & system interactions

8Duct-mounted equipment

9Dampers

10HoodsExamples:

Fitting ED5-1 is an Exhaust fitting with a round shape (Diameter). Numeral 5 indicates that the fitting is a junction, and 1 is an identifying sequential number.

Fittings SR3-1 and ER3-1 are Supply and Exhaust fittings, respectively. R indicates that the fitting is Rectangular, and 3 identifies the fitting as an elbow.