U.S. Boiler Company ASPEN ASPN-085, Installation, Operating And Service Instructions, Page: 30 / 180

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107362-01 - 8/17
Option 18 19 20 21
Illustrated in Figure 7.19 7.19 7.20 7.20
Pipe Penetration
Through Structure
Vent Roof Roof Roof Roof
Intake Roof Roof Roof Roof
Material
Vent
DuraVent
PolyPro (Rigid/
Flex)
DuraVent
PolyPro (Rigid/
Flex)
Centrotherm
InnoFlue SW/
Flex
Centrotherm
InnoFlue
SW/Flex
Intake B Vent/PVC B Vent/PVC B Vent/PVC B Vent/PVC
Nominal Diameter
Vent 2" 3" 2" 3"
Intake 2" or 3" 3" 2" or 3" 3"
Min B Vent ID 5" 6" 5" 6"
Min Equivalent Vent Length:
Model Sizes
85 30" 30" 30" 30"
110 30" 30" 30" 30"
155
Not Permitted
30"
Not Permitted
30"
205 30" 30"
270 30" 30"
Max Equivalent Vent Length (Note 1):
Model Sizes
85 60ft 135ft 60ft 135ft
110 60ft 135ft 60ft 135ft
155
Not Permitted
135ft
Not Permitted
135ft
205 135ft 135ft
270 135ft 135ft
Vent Manufacturer’s PN for Flex
Termination/Components Required
2PPS-VFT
2PPS-BV*
2PPS-FLEX**
3PPS-VFT
3PPS-BV*
3PPS-FLEX**
IFBK02****
IAWP02B
IFBK03****
IAWP03B
* Specify size of B vent (e.g. 2PPS-BV
6
is for use with 6" B vent)
** Specify length in feet.
**** Specify Flex length and B-vent diameter (e.g. IFBK02
2505
includes 25ft of flex and used with 5" B vent)
Note 1: Max vent lengths shown also apply to the intake. Flex vent reduces the maximum allowable vent length.
See equivalent lengths for flex vent shown in Table 7.14 and sizing example on page 32.
VII. Venting
C. Design Requirements Unique to Vertical Venting Systems (continued)
Table 7.13b: Summary of Vertical “B-Vent Air Chase” Vent Options
(B-Vent Chase MUST Be Sealed)
NOTICE
Vertical venting and combustion air roof penetrations (where applicable) require the use of roof flashing
and storm collar, which are not supplied with the boiler, to prevent moisture from entering the structure.