U.S. Boiler Company ASPEN ASPN-085, Installation, Operating And Service Instructions, Page: 39 / 180

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VII. Venting
D. Design Requirements Unique to Split Vent Systems (continued)
Option # 25 26 27 28 29 30 Option # 31 32 33 34
Illustrated in Figure 7.22 7.22 7.22 7.22 7.22 7.22 Illustrated in Figure 7.22 7.22 7.23, 7.24 7.23, 7.24
Pipe Penetration
Through Structure
Vent Roof Roof Roof Roof Roof Roof
Pipe Penetration
Through Structure
Vent Roof Roof Roof Roof
Intake Wall Wall Wall Wall Wall Wall Intake Wall Wall Wall Wall
Material
Vent
CPVC/PVC
(Note 2)
CPVC/PVC
(Note 2)
DuraVent
PolyPro
(Ridged)
DuraVent
PolyPro
(Ridged)
Selkirk
Polyflue
Selkirk
Polyflue
Material
Vent
Centrotherm
InnoFlue SW
Centrotherm
InnoFlue
SW
DuraVent
PolyPro
(Rigid/Flex)
DuraVent
PolyPro
(Rigid/Flex)
Intake PVC PVC PVC PVC PVC PVC Intake PVC PVC PVC PVC
Nominal Diameter
Vent 2" 3" 2" 3" 2" 3"
Nominal Diameter
Vent 2" 3" 2" 3"
Intake 2" or 3" 3" 2" or 3" 3" 2" or 3" 3" Intake 2" or 3" 3" 2" or 3" 3"
Min Equivalent Vent Length: Min Equivalent Vent Length:
Model Sizes
85 30" 30" 30" 30" 30" 30"
Model Sizes
85 30" 30" 30" 30"
110 30" 30" 30" 30" 30" 30" 110 30" 30" 30" 30"
155
Not Permitted
30"
Not Permitted
30"
Not Permitted
30" 155
Not
Permitted
30"
Not Permitted
30"
205 30" 30" 30" 205 30" 30"
270 30" 30" 30" 270 36" 30"
Max Equivalent Vent Length (Note 1): Max Equivalent Vent Length (Note 1):
Model Sizes
85 60ft 135ft 60ft 135ft 60ft 135ft
Model Sizes
85 60ft 135ft 60ft 135ft
110 60ft 135ft 60ft 135ft 60ft 135ft 110 60ft 135ft 60ft 135ft
155
Not Permitted
135ft
Not Permitted
135ft
Not Permitted
135ft 155
Not
Permitted
135ft
Not Permitted
135ft
205 135ft 135ft 135ft 205 135ft 135ft
270 135ft 135ft 135ft 270 135ft 135ft
Rigid Vent Terminals
Vent
Coupling
w/Screen
Coupling
w/Screen
2PPS-12B or
2PPS-36B
w/Screen
3PPS-12B or
3PPS-36B
w/Screen
2PF-10UV or
2PF-39UV
w/Screen
3PF-10UV or
3PF-39UV
w/Screen
Rigid Vent Terminals
Vent
ISEP02 or
ISEP0239 w/
Screen
ISEP03 or
ISEP0339
w/Screen
Not Permitted
Intake
90 Elbow
w/Screen
90 Elbow
w/Screen
90 Elbow
w/Screen
90 Elbow
w/Screen
90 Elbow
w/Screen
90 Elbow
w/Screen
Intake
90 Elbow
w/Screen
90 Elbow
w/Screen
Flex Termination
& Components
(Masonry Chimney
Chase) (Note 3)
Vent
Not Permitted
Flex Termination &
Components (Masonry
Chimney Chase) (Note 3)
Vent
Not Permitted
2PPS-FK
2PPS-FLEX**
3PPS-FK
3PPS-FLEX**
Intake Intake
90 Elbow
w/Screen
90 Elbow
w/Screen
Flex Termination
& Components
(B-Vent Chimney
Chase)
Vent
Not Permitted
Flex Termination &
Components (B-Vent
Chimney Chase)
Vent
Not Permitted
2PPS-VFT
2PPS-BF*
2PPS-FLEX**
3PPS-VFT
3PPS-BF*
3PPS-FLEX**
Intake Intake
90 Elbow
w/Screen
90 Elbow
w/Screen
Table 7.21: Summary of Split Vent System Options (continued)
* 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 Figure 7.14 and sizing example on page 32.
Note 2: At least 30" of CPVC pipe, and at least one CPVC elbow, must be installed between the boiler's vent connection and
PVC pipe.
Note 3: If masonry chimney contains flues in addition to that being used for chase, ALL must be unused.
Note 4: See vent manufacturer's installation manual for gaskets, spacers and other required vent components.
All vertical terminals require compatible roof flashing and storm collars.