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www.duravent.com
SECTION G – TERMINATION
GENERAL
An upward discharge (such as with an Exit Cone or Open Top) provides the most
effective means of dispersing chimney 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 Stack Cap is only partially effective
in excluding rain. Its effectiveness depends on chimney gas flow rate, raindrop
characteristics and wind velocity.
If rain is to enter the chimney, install a drain tee cap at the bottom of vertical run. Use
a “P” trap in the drain if the system is under positive pressure.
EXIT CONE (P-EC)
The Exit Cone is of double wall construction, with separable inner and outer
cones. The inner cone has a 28° included cone angle and is sized to increase outlet
velocity to 1.5 times chimney velocity. It attaches with a standard Inner V-Band to
the uppermost chimney pipe section. The outer cone is then pushed down into contact
with the inner cone, clamped to the outer pipe, and the gap between cones is sealed
with silicone. To prevent rain from reaching an appliance, this installation requires use
of a Drain Section (P-DS), drained Tee or both in the vertical chimney. It is
recommended to fasten (3) self-tapping screws around the bottom circumference of
the exit cone outer wall (120° apart) into the upper outer wall of the pipe section below.
Do not penetrate the inner wall.
RAIN CAP (RC)
NOTE: Stack Caps are not recommended for use with engine or turbine exhausts. The
Stack 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 V-Band. A Closure Ring is
provided as part of the Stack Cap so that the insulating air space is maintained
through the upper end of the chimney.
EXCESSIVE PRESSURE RELIEF VALVE (P-ER)
Excessive Pressure Relief Valves are intended to help control the venting of
pressure which may occur during an exhaust system backfire. Engines have the
potential to inject unburned fuel into an exhaust system during start up or due to an
engine malfunction.
This unburned fuel creates a condition where a backfire could occur. The Explosion
Relief Valve will help prevent damage to other parts such as Flex Connectors,
Silencers, Catalytic Converters, Convoluted Bellows and Heat Recovery Equipment.
Further precedence for use of Excessive Pressure Relief Valves can be found in
NFPA 37, “Standards for the Installation and Use of Stationary Combustion Engines
and Gas Turbines”. The Excessive Pressure Relief Valve should be located in the
beginning of the system and is supplied with bolts, washers, nuts, and gasket to
provide a complete gas tight connection to the 125/150 lb. ANSI flanged Flange
Adapter. The orientation of the Relief Valve should be positioned upright, as shown
Figure 42
for optimum performance.
MAINTENANCE OF ER VALVE IF USED OUTDOORS: It is RECOMMENDED to apply an
exterior grade high heat paint to the Guide Plate, Valve Seat, Valve Plate, and
Flange Adapter to ensure maximum corrosion resistance. (Ex. Rust-Oleum V200
series High Heat Industrial Aerosol) Caution: This device is designed to relieve
excessive pressure (27” W C with standard springs) in the case of an engine
malfunction for the sole purpose of protecting the physical integrity of the exhaust
system and related parts. If such malfunction occurs, the device will release hot
gases, sparks and/or flames into the immediate vicinity of the area it is located
in.
As such, this device should never be installed where human contact m a y
o c c u r d u e t o such release.
Excessive Pressure Relief Valve
Figure 42 – Excessive Pressure Relief Valve
GENERAL INFORMATION
M&G DuraVent reserves the right to make changes at any time,
without notice, in design, materials, specifications, prices.
Consult your local distributor for chimney system code
information.
WARRANTY
These products have a 15-year limited warranty. Please read the
warranty to be familiar with its coverage.
Retain this manual. File it with your other documents for future
reference.
PRODUCT REFERENCE INFORMATION
Please contact M & G D ur a Ven t for the phone number of your
nearest DuraVent dealer who will answer your questions or address
your concerns.
Further information may be obtained by visiting:
www.duravent.com
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