Takagi T-H2-DV Installation Manual And Owner's Manual page 11

The T H2 DV can be connected with PVC or ABS venting (temperature rated up to 149°F). However,
TAKAGI recommends PVC (or ABS) venting certified to ULC S636 standards.
Item
Exhaust pipe &
Fittings
Pipe Cement/Primer
x
The maximum length of exhaust vent piping must not exceed 50 ft. for 4" venting and 25 ft. for
3" venting (deducting 5 ft. for each elbow used in the venting system). Do not use more than 5
elbows for 4" venting and 2 elbows for 3" venting.
x
When the horizontal vent run exceeds 5 ft., support the vent run at 3 ft. intervals with overhead
hangers.
Diameter
3"
4"
* For each elbow added, deduct 5 ft. from max. vent length.
No. of Elbows
0
1
2
5
Excludes elbow termination, rain caps, or the 3" PVC Concentric Termination
For details on the vent connection to the T H2 DV, refer to P.14
This is a Category IV appliance and must be vented accordingly. The vent system must be sealed air
tight. All seams and joints without gaskets must be sealed with high heat resistant silicone sealant or UL
listed aluminum adhesive tape having a minimum temperature rating of 160°F. For best results, a vent
system should be as short and straight as possible.
x
The T H2 DV is a Category IV appliance and must be vented accordingly with any 4" vent
approved for use with Category III/IV or Special BH type gas vent.
x
TAKAGI recommends the "T Vent" line manufactured by TAKAGI (Refer to Takagi's "T Vent"
brochure for details). However, the following are also UL listed manufacturers: ProTech Systems
Inc. (FasNSeal), Flex L Inc., Z Flex Inc. (Z Vent III), Metal Fab Inc., and Heat Fab Inc. (Saf T Vent).
x
Follow the vent pipe manufacturer's instructions when installing the vent pipe.
Exhaust vent (PVC & ABS vent)
Material
Schedule 40 PVC
PVC DWV
Schedule 40 CPVC
Schedule 40 ABS DWV
PVC
CPVC
ABS
NOTE: Do NOT Use Cellular Foam Core Pipe
Max. No. of Elbow
2
5
Max. Vertical or Horizontal Length
3" venting
25 ft.
20 ft.
15 ft.
N/A
Exhaust vent (Stainless steel vent)
11
United States
ANSI/ASTM D1785
ANSI/ASTM D2665
ANSI/ASTM F441
ANSI/ASTM D2661
ANSI/ASTM D2564
ANSI/ASTM F493
ANSI/ASTM D2235
Max. Vertical & Horizontal (Total) Vent Length
25 ft.
50 ft.
Page
Installation
Canada
ULC S636 Certified
Materials Only
4" venting
50 ft.
45 ft.
40 ft.
25 ft.