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VII. Venting

A. Vent System Design

There are three basic ways to vent this boiler:
•

Horizontal (“Side Wall”) Twin Pipe Venting (Figure 7.0a)

- Vent system exits the building through an outside wall.

Combustion air and flue gas are routed between the boiler and the terminal(s) using separate pipes for at least part of the

way. A summary of Horizontal Twin Pipe venting options is shown in Table 7.5.

•

Vertical Twin Pipe Venting (Figure 7.0b)

- Vent system exits the building through a roof. Combustion air and flue gas

are routed between the boiler and the terminal(s) using separate pipes for at least part of the way. A summary of Vertical

Twin Pipe venting options is shown in Table 7.13

•

Split Venting (Figure 7.0c)

- Exhaust system exits the building through a roof, and combustion air is drawn from a

terminal mounted on the side wall. A summary of split venting options is shown in Table 7.21

All of these systems are considered “direct vent” because the air for combustion is drawn directly from the outdoors into the

boiler. One of the vent option columns in Tables 7.5, 7.13, 7.21 must match the planned vent and air intake system exactly.

Design details applying to all vent systems are shown in this section. Observe all design requirements in this section, as well as

those unique to the type of system being installed:

• B - Design Requirements Unique to Horizontal Twin Pipe Vent Systems

• C - Design Requirements Unique to Vertical Twin Pipe Vent Systems

• D - Design Requirements Unique to Split Vent Systems

WARNING

Asphyxiation Hazard. Failure to vent this boiler in accordance with these instructions could cause

products of combustion to enter the building resulting in severe property damage, personal injury or

death.
Do not interchange vent systems or materials unless otherwise specified.
The use of thermal insulation covering vent pipe and fittings is prohibited.
Do not use a barometric damper, draft hood or vent damper with this boiler.
When using the CPVC/PVC vent option, the use of CPVC is required when venting in vertical or

horizontal chase ways.
Do not locate vent termination where exposed to prevailing winds. Moisture and ice may form on

surface around vent termination. To prevent deterioration, surface must be in good repair (sealed,

painted, etc.).
Do not locate air intake vent termination where chlorines, chlorofluorocarbons (CFC’s), petroleum

distillates, detergents, volatile vapors or other chemicals are present. Severe boiler corrosion and

failure will result.
The use of cellular core PVC (ASTM F891), cellular core CPVC or Radel (polyphenolsulfone) is

prohibited.
Do not locate vent termination under a deck.
Do not reduce specified diameters of vent and combustion air piping.
When installing vent pipe through chimney, as a chase, no other appliance can be vented into the

chimney.
Do not allow low spots in the vent where condensate may pool.

DANGER

Failure to follow this warning could result in asphyxiation and/or carbon monoxide poisoning. Correct

venting material and installation is required for proper vent operation. PVC Vent Systems must include at

least 30 inches of CPVC and one CPVC elbow between the boiler and PVC vent piping. See this Section, VII.

Venting for complete information.