U.S. Boiler Company K2WT-080B, Installation, Operating And Service Instructions

Page: 39 / 168

39 107672-01- 7/17
Option # 37 38 39
Illustrated in Figure 7.23, 7.24 7.23, 7.24 7.25a
Pipe Penetration
Through Structure
Vent Roof Roof Roof
Intake Wall Wall Wall
Material
Vent
Centrotherm
InnoFlue (Rigid/Flex)
Centrotherm
InnoFlue (Rigid/
Flex)
DuraVent FasNSeal
Flex
Intake PVC PVC PVC
Nominal Diameter
Vent 2” 3” 3”
Intake 2” or 3” 3” 3”
Min Equivalent Vent Length:
Models
080 48” 48” 48”
100 48” 48” 48”
120
Not Permitted
48” 48”
150 52” 52”
180 52” 52”
Max Equivalent Vent Length (Note 1):
Models
080 60ft 135ft 135ft
100 60ft 135ft 135ft
120
Not Permitted
135ft 135ft
150 135ft 135ft
180 135ft 135ft
Rigid Vent Terminals
Vent
Not Permitted
Intake
Flex Termination
& Components
(Masonry Chimney
Chase) (Note 3)
Vent IFCK02** IFCK03**
3FSFLEX-**
FSFLEXRC3
Intake
90 Elbow
w/Screen
90 Elbow
w/Screen
90 Elbow
w/Screen
Flex Termination &
Components (B-Vent
Chimney Chase)
Vent IFBK02**** IFBK03****
Not Permitted
Intake
90 Elbow
w/Screen
90 Elbow
w/Screen
* Specify size of B vent (e.g. 2PPS-BV6 is for use with 6” B vent).
** Specify length in feet.
**** Specify Flex length and B vent diameter (e.g. IFBK022505 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 in some applications. See equivalent lengths for flex vent shown in Table 7.14 and sizing
example on page 35.
Note 2: First 30” plus first exhaust elbow are CPVC.
Note 3: See vent manufacturer’s installation manual for gaskets, spacers and other required vent
components.
All vertical terminals require compatible roof flashing and storm collars.
VII. Venting
D. Design Requirements Unique to Split Vent Systems (continued)
Table 7.21: Summary of Split Vent System Options (cont.)