14
1. These boilers may be vented horizontally as shown
in
Figure #9
. The vent pipe is pitched
DOWN
from
the boiler to the vent termination.
Do not
connect
other appliances to this vent.
2.
Vent Pipe Material:
a) UL Listed Z-Flex Z-Vent stainless steel vent
pipe from boiler to vent termination,
-or-
b) UL Listed Heat-FabSaf-T-Vent stainless steel
vent pipe from boiler to vent termination,
-or-
c) UL Listed Flex-L StaR-34 stainless steel vent
pipe from boiler to vent termination,
-or-
d) UL Listed ProTech FasNSeal stainless steel
vent pipe from boiler to vent termination.
3.
Clearance to Combustible Materials:
For stainless steel vent pipe maintain 6” minimum
air space clearance to combustible materials.
4.
Vent Pipe Size:
a) 2, 3, 4 and 5 section boilers use 3” vent pipe
connected directly to the outlet of the induced
draft blower.
b) 6 and 7 section boilers use 4” vent pipe, starting
with a 3” to 4” stainless steel vent pipe transition
that is connected directly to the outlet of the
induced draft blower. Do not use 3” vent pipe
on 6 or 7 section boilers.
5.
Vent Pipe Length:
a) For stainless steel vent pipe, the maximum
horizontal vent length is 30 feet plus one 90
°
elbow plus termination fitting.
b) Minimum horizontal vent length for all vent
materials is 2 feet plus one 90° elbow plus
termination fitting.
c) For additional elbows reduce the maximum
vent length as shown:
• 3” - 90° elbow - reduce vent length 3 feet per
each 3” elbow
• 4” - 90° elbow - reduce vent length 6 feet per
each 4” elbow
6
. Vent Termination Fitting:
For all vent pipe materials, you may use either:
a) a 90
°
elbow pointing down, fitted with a minimum
1/4” mesh screen to keep out rodents and birds.
The elbow shall be of the same material and
size as vent pipe. The elbow exit should be at
least 6” away from exterior wall as shown in
Figure 9.
-or-
b) Tjernlund VH-1 Series side wall vent hood. For
2, 3, 4, 5 section boilers use VH-1-3”, For 6, 7
section boilers use VH-1-4”.
7.
Vent Pipe Termination Location (Figure #10):
a) When venting through combustible walls,
combustible clearances must be considered.
The
VH-1 Side wall vent hood
provides both
the outside vent termination and a double wall
pipe for passing through a combustible wall up
to 8” thick (VH-1-4”) or 9” thick (VH-1-3”). The
hole in the wall must be 6¼” square for 3” vent
pipe and 7 1/2” square for 4” vent pipe, in order
to insert the VH-1 side wall vent hood. The VH-1
may also be used in noncombustible walls.
b) If the
90’ elbow
is the termination fitting of
choice, then the single wall pipe will be passing
through the side wall. For combustible walls,
a UL listed thimble shall be used where the
single wall pipe passes through the wall. For
combustible walls using Z-Vent,
Saf-T-Vent, or
StaR-34 vent pipe, use the following:
• 3” vent pipe - use Simpson’s Duravent
#905295 3” thimble or equivalent.
• 4” vent pipe - use Simpson’s Duravent
#915295 4” thimble or equivalent Maximum
wall thickness with this thimble is 7 inches.
hoRIZoNtAl VeNtING INStRuCtIoNS
Example: 6
section boiler requires 3 elbows
plus the termination fitting. This means 2
additional 4” elbows will be used, at 6 feet per
elbow. This is equivalent to 12 feet of pipe (2 x
6 =12), therefore maximum vent length is now
18 feet (30 -12 =18).
Summary of Contents for XEB-2
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