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Finned copper tube gas boilers & water heaters – Boiler Manual
10
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VERTICAL VENT, POSITIVE PRESSURE,
CATEGORY IV
(Vent pipe equivalent length up to
60 ft
,
18.3 m
maximum)
Masonry chimneys, when used, must be lined with a
metal liner certifi ed for Category IV venting.
A thorough inspection of the masonry chimney must be performed
to ensure that the chimney is clean, properly constructed lined, and
sized. Exterior masonry chimneys should not be used unless
properly lined to prevent condensation and draft problems.
Vent Connections
Locate the boiler/water heater as close to the chimney as
possible. Use the shortest, straightest vent connector possible for
the installation. If horizontal runs exceed
5 ft
,
1.5 m
they must be
supported at
3 ft
,
0.9 m
intervals with overhead hangers. Use a
single wall stainless steel vent pipe the same diameter as the fl ue
collar to connect the boiler/water heater to a masonry chimney.
When using a listed metal chimney system use the appropriate vent
connector.
Th e vent connector should be sloped up toward the chimney at a
minimum rate of
1/4 in/ft
,
21 mm/m
. On masonry chimneys
the connector must terminate fl ush with the inside of the chimney
fl ue, Figure 7. Fasten each single wall vent connection with at least
3 corrosion resistant sheet metal screws.
Figure 6
Vertical Venting with a Metal Chimney System
Figure 7
Vertical Venting Using a Lined Masonry Chimney
Always provide a minimum clearance of
6 in
,
152 mm
between
single wall vent pipe and any combustible materials.
Failure to maintain minimum clearances between vent
connectors and any combustible material can result
in a fi re causing extensive property damage, severe
personal injury or death!
Exit cones are favorable when used to increase
the velocity of the fl ue gas exiting the stack and,
may also help, in cold climates, to reduce ice build-
up. Exit cone terminations must be supplied by
others, installed per manufacturer’s instructions,
and meet local and federal code.
OUTDOOR VENTING
When installed outdoors the Futera III must be fi tt ed with the factory
supplied outdoor hood, air intake adapter with fi lter and exhaust
terminal, see Figure 7A. Multiple units must be spaced per Figure 7B.
Th e boiler/heater must be at least
2 ft
,
.62 m
from any door, window
or gravity air inlet into any building and at least
3 ft
,
1 m
from any
overhang unless local codes dictate diff erently.
generic exit cone
