State 520 - Manual (Page 11)

Installation
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Excludes elbow termination, rain caps, or the 3” PVC Concentric Termination
For details on the vent connection to the Direct Vent Indoor models, refer to P.14
* For each elbow added, deduct 5 ft. from max. vent length.
‐Exhaust vent (PVC and ABS vent) ‐
The Direct Vent Indoor models can be connected with PVC or ABS venting (temperature rated up to
149°F). However, the manufacturer recommends PVC (or ABS) venting certified to ULC S636 standards.
Item Material United States Canada
Exhaust pipe and
Fittings
Schedule 40 PVC ANSI/ASTM D1785
ULC S636 Certified
Materials Only
PVC‐DWV ANSI/ASTM D2665
Schedule 40 CPVC ANSI/ASTM F441
Schedule 40 ABS‐DWV ANSI/ASTM D2661
Pipe Cement/Primer
PVC ANSI/ASTM D2564
CPVC ANSI/ASTM F493
ABS ANSI/ASTM D2235
NOTE: Do NOT Use Cellular Foam Core Pipe
 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.
 When the horizontal vent run exceeds 5 ft., support the vent run at 3 ft. intervals with overhead
hangers.
Diameter Max. No. of Elbow Max. Vertical and Horizontal (Total) Vent Length
3” 2 25 ft.
4” 5 50 ft.
No. of Elbows
Max. Vertical or Horizontal Length
3” venting 4” venting
0 25 ft. 50 ft.
1 20 ft. 45 ft.
2 15 ft. 40 ft.
5 N/A 25 ft.
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.
 The Direct Vent Indoor models are 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.
 The manufacturer 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).
 Follow the vent pipe manufacturer’s instructions when installing the vent pipe.
‐Exhaust vent (Stainless steel vent)‐