DuraVent FasNSeal Single-Wall - Manual (Page 17)

17
• Proper clearances to combustibles must
be maintained over the entire length of the
system (refer to Figure 17).
• Never install FNS on an appliance that is not
listed for use with a Special Gas Vent or Type
BH vent.
• Additional FNS vent lengths can be
installed for extended runs. The overall
equivalent length of the system shall not
exceed the specifications of the appliance
manufacturer’s instructions.
• Horizontal vent runs shall have a slope of
no less than ¼ inch (6.4mm) every 12 inches
(305mm) to prevent collection
of condensates.
• The termination should be away from trees,
shrubs, or decorative items as flue gases
could cause damage.
• The venting system must be free to expand
and contract.
• Check for unrestricted vent movement
through walls, ceilings, and roof penetrations.
• Different Manufacturers Have Different joint
Systems and Adhesives. Do Not Mix Pipe,
Fittings, or joining Methods from
Different Manufacturers.
• Clearances must be increased in
applications exceeding 400 degree
outlet temperatures.
gENERAL TERMINATION
gUIDELINES:
NOTICE: The following is to be used as a
guideline only.
Check with the Code enforcement office
in your area forspecific termination
requirements. A mechanical draft vent
system, excluding direct-vent appliances,
shall terminate at least 4 feet (1219 mm)
below, 4 feet (1219 mm) horizontally from,
or 1 foot (305 mm) above any door, window,
or gravity air inlet into any building. The
bottom of the vent terminal shall be located
at least 12 inches (305 mm) above grade. In
geographical areas where snow accumulates,
terminate the system at least 12 inches above
the snow line. The termination must be kept
clear of snow and ice at all times. Do not
terminate over public walkways or over an
area where condensate or vapor could create
a nuisance or hazard or could be detrimental
to the operation of regulators, relief valves, or
other equipment.