Chapter 2 - Direct Vent Installation Of Vent/Air Piping; Direct Vent - Vertical - Through The Roof Or Unused Chimney; Determine Termination Location - IDEAL Exalt Solo 110 Manual

CHAPTER 2 - DIRECT VENT INSTALLATION OF VENT/AIR PIPING

A Direct Vent appliance utilizes uncontaminated outdoor
air (piped directly to the appliance) for combustion.
2.1. Direct Vent - Vertical - Through the Roof
or Unused Chimney
NOTICE
• The installation must conform to the
requirements of the authority having
jurisdiction or, in the absence of such
requirements, to the National Fuel Gas Code,
ANSI Z223.1/ NFPA 54, and/or Natural Gas and
Propane Installation Code, CAN/CSA B149.1.
• When using an inoperative chimney as a
means of a chase for the vent, the surrounding
space within the chimney cannot be used to
draw combustion air or vent another appliance.
WARNING
A gas vent extending through a roof must not
terminate near an adjacent wall or below any building
extensions such as roof eaves, balconies or decks.
Failure to comply with the required clearances
in this manual can result in substantial property
damage, serious injury, or death.
NOTICE
The information and diagrams outlining
the fittings and method of terminating the
vent/combustion air are directly related to
PVC/CPVC vent systems. When utilizing an
AL29-4C® Stainless Steel or Polypropylene
vent system, there may be some variations.
Consult the appropriate vent manufacturer for
recommendations and clarifications.

2.1.1 Determine Termination Location

Locate the vent and combustion air termination using
the following guidelines:
1. The total length of the vent or combustion air piping
must not exceed the limits given in Table 1 on page 4.
NOTICE
The 90º elbows used to terminate the
combustion air inlet and vent outlet exterior
of the building have been accounted for in the
maximum allowable vent or combustion air
piping length provided in Table 1.
2. The combustion air piping must terminate in
an upside down "U" shape fashion using two
90° elbows, as shown in Fig. 1 on page 12. The
termination must be located 12" [30.5 cm] (18" [45.7
cm] in Canada) above the highest anticipated snow
level.
3. The vent piping must terminate vertically with a
coupling to accept the bird screen and must be
located 12" to 24" [30.5 cm to 61 cm] above the
combustion air inlet as shown in Fig. 1 on page
12.
4. The vent and combustion air terminations must be
located at a radial distance of 12" to 24" [30.5 cm to 61
cm] from centerline of vent termination to centerline
of air termination as shown in Fig. 1 on page 12.
5. The following should be considered when
determining the location of the vent and
combustion air terminations:
a. Locate the vent termination where flue vapors
will not damage surrounding shrubs, plants, air
conditioning equipment or be objectionable to
the homeowner.
b. The flue products will form a noticeable plume
of water vapor as they condense in colder air.
Avoid terminating the vent in areas where the
plume could obstruct window views.
c. Prevailing winds could cause freezing of flue
gas condensation and a buildup of water / ice
on surrounding plants, building surfaces or
combustion air inlet.
d. Avoid locations where prevailing winds could
affect the performance of the boiler or cause
recirculation of the flue gases, such as inside
corners of buildings, near adjacent buildings,
vertical surfaces, window wells, stairwells,
alcoves, courtyards, or other recessed areas.
e. Do not terminate the vent above doors or
windows, flue condensate could freeze causing
ice formations.
f. Locate the vent termination to prevent possible
condensate damage to exterior finishes.
g. Avoid locations of possible accidental contact
of flue vapors with people or pets.
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