Figure 11a: Recommended Connections to Common Vent Breeching
Interconnection of groups of units must never be accomplished via a “tee”. As shown in
Figure 11b, change the direction with one of the mains and then connect the second three
diameters (common section diameter) from this turn via a 45° connection.
Figure 11b: Required Interconnection of Groups of Units
Figure 12 illustrates the preferable “transition vent section” when making the 45° connection into
a main. The main can also remain at one diameter, as long as it is sized for the total number of
units vented and the 45° branch connection is retained. Use of the preferred “transition” assembly
will reduce the overall system pressure drop.
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