11
• Each common section may include vertical sections, but the nal terminations must be horizontal through the wall.
Vertical section lengths must be included in the total equivalent length.
• The horizontal vent section must be sloped upward at least 1/4” per foot towards the vent terminal and
• Each section must be supported as detailed in the above procedure.
TERMINATIONS
The placement of the vent and air terminals must follow the guidelines for terminal location found in the water
heater’s Instruction Manual. All required clearances to building features are the same as found in the water heater’s
Instruction Manual. The combustion vent terminal is a coupling with a screen that nishes the end of the pipe. The air
inlet terminal must use the 90° elbow pointed down as shown in Figure 6 (page 9). Clearances to the ground and
to anticipated snow level must be as shown in Figure 6. The ends of both terminals must be protected with the bird
screens supplied with the terminations.
POLYPROPYLENE COMMON VENT KIT INSTRUCTIONS
(100227395 OR 100223774)
This kit instruction is a supplement to the Instruction Manual that is supplied with the water heater. The multiple
heater installation must satisfy all the requirements of the Instruction Manual as well as the requirements of this kit
instruction. The installer may also consult with installation instructions from the vent manufacturer. In the event of any
conict between the documents, these instructions take precedence. The kit is meant to accommodate heaters that
maintain the recommended 24” clearance between the water heaters, (52” on center for the 120 to 250 models and
57” on center for the 300 to 500 models).
The heaters listed previously may also be common vented using a Polypropylene system manufactured by M&G
Duravent. This is a system listed to UL 1738 and ULC S636 and may be required in some localities.
POLYPROPYLENE PARTS LIST
Each kit contains the adapters needed to connect the vent and air intake system to one heater. Additional parts are
needed to create the connectors, common sections and vent terminations. A list of additional parts is included below
for your convenience.
For example, to install a common vent for two heaters requires two common vent kits shown in Figure 9, the
additional parts listed in Table 7, and the necessary polypropylene parts needed to extend the pipe systems between
the heaters and the terminations.
2
1
3
FIGURE 9. POLYPROPYLENE COMMON VENT KIT
(120 - 250 MODELS) (ONE KIT NEEDED FOR EACH HEATER)
TABLE 5. POLYPROPYLENE COMMON VENT KIT (120 - 250 MODELS)
Item
No.
Part
No.
Description
Kit
Supplied
1
100227395
VENT ADAPTER,OUTLET,6”,PP,DURAVENT 1
2 VENT ADAPTER,INLET,6”,PP,DURAVENT 1
3 VENT ADAPTER CONNECTOR,DURAVENT 1