Direct Vent - Vertical Vent And Sidewall Combustion Air; Determine Termination Location - IDEAL Exalt Solo 110 Manual

CHAPTER 2 - DIRECT VENT INSTALLATION OF VENT/AIR PIPING
2.3. Direct Vent - Vertical Vent and Sidewall
Combustion Air
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/
• 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.
20
CSA B149.1.

2.3.1 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
Do not include the 90º elbows used to terminate
the combustion air inlet exterior of the building
when determining the total length of pipe.
2. The combustion air piping must terminate with a
90º elbow. Fig. 12 on page 19 shows a snorkel
termination option. The combustion air pipe can
also terminate using a 90º elbow directed down as
shown in Fig. 6 on page 17. The termination must
be located 12" [30.5 cm] minimum above grade /
highest anticipated snow level.
3. The vent piping must terminate vertically with
a coupling to accept the bird screen and must
be located 12" [30.5 cm] (18" [45.7 cm] in Canada)
above the highest anticipated snow level.
4. 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.