Bosch GWH 715 ES User Manual page 10

Installation instructions
3.3.1 Vent material and specifications
Establish vent clearances that comply with the vent
manufacturer's specifications. In all cases, follow local
codes. See Table 2.
Diam. Min.
lenght
Exhaust 3 or 4 3 feet
Vent
inches
Intake 3 or 4 1 90°
Vent
inches elbow
Table 2 Venting Specifications
The appliance should be located as close to the point
of vent termination as possible. The maximum vent
length is 26 feet (8 m) with one 90 degree elbow and
approved terminator. Subtract 2.5 feet from the total
vent length for each additional 90° elbow used (a
maximum of three 90° elbows are permitted in the
total equivalent vent
section 3.3.4), or subtract 1.25 feet for every 45° elbow
used. Horizontal sections of vent must pitch upwards
towards termination ¼" for every foot of horizontal
length, to prevent the pooling of condensate, and be
supported at 4 foot intervals with overhead hangers.
Exception: horizontal run between last elbow
and termination must pitch down to termination
1/4" per foot.
Note: For horizontal terminations, venting must
terminate once it penetrates to the outside of the
structure. There must be no sections of vent pipe
exposed to the outdoors other than the
termination.
Note: Listed thimbles or collars are necessary where
venting passes through wall and ceiling partitions. If the
vent system passes through combustible areas where
the vent clearance requirements cannot be maintained,
it is permissible to chase straight sections of sealed 3
inch single wall vent through 4 inch (or greater) Type-B
vent. The distance to combustibles using this chase
1)
technique is 1 inch . Note: Type-B vent must never
be used as the actual exhaust vent system for the
appliance, as it is not gas tight and illegal for use
with this appliance. This will create a serious
health hazard and void the warranty.
1) in all cases, follow local codes.
10
Max. Material
length
26 feet with Sealed single wall
1 90° elbow stainless steel
and terminal (AL29-4C)
26 feet with Sealed PVC or
1 90°elbow any other rigid or
and terminal semi rigid pipe
length calculation,
3"
VENTING
3"
Horizontal 2SVSTB03
Terminal
3" Vertical
2SVSRCF03
terminator
Table 3 Terminator Part Numbers
Fittings or Piping
45 degree elbow
90 degree elbow
pipe per foot
Table 4 Friction Loss Equivalent in piping and fittings
For specific questions concerning vent material,
specifications, usage or installation, please contact the
vent manufacturer directly.
Company
see
Z-flex
ProTech Industries
Heat-Fab
Table 5 Vent manufacturers
Minimum exhaust vent length
( > 3 feet of straight pipe)
6720608158-80.2AL
Fig. 8 (combustion air piping not shown)
Z flex Protech Heat Fab
FSTB3 9390 TEE
FSRC3
Equivalent
feet
1.25
2.5
1
Contact info
www.z-flex.com
800-654-5600
www.protechinfo.com
800-766-3473
www.heatfab.com
800-772-0739
5300CI
m
0.38
0.76
0.30
6 720 608 158