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Maximum Vent Length :
Direct Vent Maximum Vent Length
Model
Number Max Vent Length (feet)
3" PVC, CPVC, or ABS Max Vent Length (feet)
4" PVC, CPVC, or ABS
EF60T125, EF100T150 120 170
EF60T150, EF100T199 100 150
EF60T199, EF100T250
EF100T300 80
60 130
120
Table 3
Determining required vent length:
1. Determine the total length of straight vent pipe (in feet) required for both the intake and the exhaust.
2. Add 5 feet of venting for every 90° elbow.
3. Add 2 ½ feet of venting for every 45° elbow.
4. Total vent length can not exceed “Max Vent Length” in Table 3. 5. Air intake can not exceed exhaust by more than 30 feet in any venting situation.
NOTICE
Do not include the 3” exhaust elbow or vent terminals in determining maximum vent length.
POWER VENT INSTALLATION
Power venting is where the indoor air is used and the exhaust is vented to the outside. Venting may be run
horizontally through an outside wall or vertically through a roof through using either 3 inch (7.6 cm) or 4 inch (10.2
cm) diameter PVC, ABS or CPVC. This water heater is supplied with a screened intake and exhaust 90° elbow
referred to as the exhaust vent terminal and the air intake terminal.
Power Vent Terminal Location
Refer to the “Direct Vent Terminal Location” section previously mention to determine the proper exhaust vent
location. Plan the vent system layout so that proper clearances are maintained from plumbing and wiring.
Vent pipes serving power vented appliances are classified by building codes as “vent connectors”. Required
clearances from combustible materials must be provided in accordance with information in this manual under
LOCATION OF WATER HEATER and CLEARANCES, and with National Fuel Gas Code and local codes.
NOTICE
This unit can be vented using only PVC (Class 160, ASTM D-2241 Schedule 40, ASTM D-1785;
or Cellular Core Schedule 40 DWV, ASTM F-891), Schedule 40 CPVC (ASTM F-411), or ABS
(ASTM D-2661) pipe. The fittings, other than the TERMINATIONS should be equivalent to PVC-
DWV fittings meeting ASTM F-2665. (Use CPVC fittings, ASTM F-438 for CPVC pipe and ABS
fittings, ASTM D-266/3311 for ABS pipe.) If CPVC or ABS pipe and fittings are used, then the
proper cement must be used for all joints, including joining the pipe to the Termination (PVC
material). PVC materials should use ASTM –D2564 grade cement; CPVC materials should use
ASTM F-493 grade cement; and ABS materials should use ASTM D-2235 grade cement.
For water heaters in locations with high ambient temperatures (above 100°F) and/or insufficient
dilution air, it is recommended that CPVC or ABS pipe and fittings (MUST USE SUPPLIED
VENT TERMINAL) be used.
INTERNET VERSION FOR REFERENCE ONLY