Common Vent Breeching (Manifolded) - Watts AERCO MFC Series Pre-Installation Application Manual

MFC Series Boiler Vent and Combustion Air Guide

18. Common Vent Breeching (Manifolded)

Connections to common vent breeching or duct work must be accomplished with a 45° elbow in
the direction of flow in the main breeching. "Tees" should not be used to accomplish these
connections - see Figure 9a. The recommended minimum individual boiler vent length before
joining the common vent breech is 10 feet.
NOT
REQUIRED
APPROVED
Figure 9a: Recommended Connections to Common Vent Breeching
Interconnection of groups of units must never be accomplished via a "tee". As shown in Figure 9b,
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 9b: Required Interconnection of Groups of Units
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