27
R2KA 34 /20 - RAD - ING - Inst.Manual - 2002.1_CSA
1. INSTALLATION
INST
ALLER
1.1.20. TYPES OF EXHAUST SYSTEMS
GENERAL INTRODUCTION
The venting 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.
Horizontal exhaust runs shall slope upwards not less
than 1/8 in/ft [10.5 mm/m] from the boiler to the vent
terminal although 1/4 in/ft [21 mm/m] is preferred. Venting
shall be installed so as to prevent the accumulation of
condensate throughout the vent run. Provide means for
drainage of condensate on all vertical exhaust runs and
where necessary.
Horizontal combustion air intake runs should slope
downwards not less than 1/4 in/ft [21 mm/m] from the
boiler to the air intake terminal where possible.
For installations in which the combustion air run cannot
slope to the outdoors, it is recommended that a trap be
installed closed to the appliance (see figure ‘H’).
Where not possible a water trap shall be installed so as
to collect moisture or water from entering into the air
box of the water heater. Provide means for drainage of
moisture and water on all vertical air intake runs and
where necessary.
Traps, if used, should have pipe slopes not less than 1/4
in/ft [21 mm/m] downwards to the trap.
The use of thermal insulation shall be prohibited on
non-metallic vent pipe and fittings in conditioned space.
However, for vent runs in unconditioned space where
freezing is a concern, a minimum of 1/2” thick Armaflex
is recommended.
I
- CO-LINEAR VENT (FRESH AIR AND EXHAUST)
The Gas-Fired wall mounted hot boilers can be
installed with two separate pipes. The two separate
pipes consists of one for the exhaust an the other for
combustion air intake.
Please refer to Table 1: Allowable vent lengths for
maximum vent and combustion air intake runs.
Co-linear vent installations can be either be installed
through the wall or through the roof.
I (
a
)
- THROUGH THE WALL LNSTALLATION:
Through the wall installations can terminate with two
separate pipes or with a concentric terminal.
Please refer to figure ‘A’ for installations using
terminations using co-linear vent.
Refer to figures ‘B’ and ‘C’ for installations using co-
linear vent with co-axial terminal.
INSULATED
EXHAUST
12” minimum
12” minimum
TRAP
TRAP
Air Intake
Distance above avg.
snow fall or grade
Ref: CSA B149.1
Exterior wall
1” Min
2” Max
(From wall
or Face Plate)
Clamp or Strap
(Field Supplied)
Exhaust
Air Intake
Exhaust
6”minimum
Exhaust
Air Intake
12” minimum
12” minimum
above average
snow fall
Tee Termination
Air Intake
Exhaust
Exhaust
8” - 1
2”
4” - 6
”
12” minimum
above average
snow fall
6”
fig. B
fig. H
fig. A
INSTALLATION
