Terminations; General; Vent Cap; Sidewall Termination - ENERVEX PowerStack EPSC Installation & Operating Manual

010.8030.1222 12.22

5. TERMINATIONS

5.1 GENERAL

An upward discharge (such as with an Exit Cone or Open
Top) provides the most effective means of dispersing vent
gases into the atmosphere and away from immediate
surroundings. Such terminations however, will allow entry of
rain unless there is upward flow at high velocity. A Vent Cap
is only partially effective in excluding rain. Its effectiveness
depends on vent gas flow rate, raindrop characteristics and
wind velocity.
With all vent terminations, where rain may enter the vent
outlet, the following precautions must be taken:
1. All inner joints must be sealed using the appropriate seal
or sealant.
2. Install a Vertical Drain Section at least 5 pipe diameters
below the vent outlet, but above any Tee or Elbow.
Fig 5-1: Vent Cap
3. If a 90° or 45° Tee is used to catch rain, connect the Tee
Cap drain fitting to a suitable drain. Use a trap in the drain if
the system is under positive pressure.
Note: The Vertical Drain Section and Drain Tee Cap may both
be used.

5.2 VENT CAP

The Vent Cap combines partial protection against rain entry
with low exit flow resistance. (Resistance coefficient is roughly
0.05 velocity heads.) It is mounted to the end of a standard
pipe section by use of the standard Locking Band.
Bird Screen

5.3 SIDEWALL TERMINATION

The Sidewall Termination is used for sidewall vented
applications. It incorporates a bird screen/mesh. For
Fig 5-2: Side Wall Termination Cap
condensing applications, a Tapered Stub Mesh is
recommended.
5.4 MITRE CUT SECTION
The Miter Cut is an alternative termination to a Side Wall
Termination Cap.It has a 45° slope facing down.
Bird Screen
Fig 5-3: Mitre Cut Section
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