10
2.5.2
Sidewall Air Inlet
Figure 7: Sidewall Vent and Air Inlet Configuration
* Please check local codes for minimum distance above
ground or snow levels
Location of a Sidewall Air Inlet Cap
1) The total length of piping for air inlet must not
exceed the limits stated in Table 6.
2) The point of termination for the sidewall air inlet
cap must be located a minimum of 12 inches
(0.30m) away from the flue gas termination, but
never above.
3) The air piping must terminate in a down-turned
elbow to avoid recirculation of flue products into
the inlet air stream.
4) DO NOT terminate closer than 4 feet (1.25m)
horizontally and vertically from any electric meter,
gas meter, regulator, relief valve, or other
equipment. In all cases local codes take
precedence
5) DO NOT terminate the air inlet in a window well,
stairwell, alcove, courtyard or other recessed area
as wind eddies could affect performance or cause
recirculation.
6) The air inlet cannot terminate below grade.
7) Locate terminations so they are not likely to be
damaged by foreign objects, or exposed to build-
up of debris.
8) Perform regularly scheduled inspections to ensure
that the air inlet terminal is unobstructed.
Termination and Fittings
1) The air inlet opening must be at least 12 inches
(0.30m) away from (never above) the vent
termination and at least 3 feet (1m) above grade
or above normal maximum snow levels.
2.5.3
Sidewall Concentric Vent/ Air
A listed concentric vent kit can be used with the TH
appliance. Both combustion air and vent pipes must
terminate outside the structure.
1)
The total length of piping for venting or air must not
exceed the limits stated in Table 8.
2)
The bottom of the termination shall be located at
least 3 feet (1m) above grade or above normal snow
levels. In all cases the appliance shall be installed in
accordance with local codes
3)
The termination MUST NOT terminate below a forced
air inlet at any distance
4)
The termination cannot terminate below grade.
Position the termination where vapours will not
damage walls or plants or may be otherwise
objectionable.
5)
The termination shall not be installed closer than 3 feet
(1m) from an inside corner of an L-shaped structure,
window well, stairwell, alcove, courtyard or other
recessed area as wind eddies could affect boiler
performance or cause recirculation.
6)
DO NOT terminate closer than 4 feet (1.25m)
horizontally and vertically from any electric meter, gas
meter, regulator, relief valve, or other equipment. In all
cases local codes take precedence
7)
Position termination so they are not likely to be
damaged by foreign objects, or exposed to a build-up of
debris.
8)
Flue gas condensate can freeze on exterior walls or on
the vent cap. Frozen condensate on the vent cap can
result in a blocked flue condition. Keep the vent
cap/terminal clear of snow, ice, leaves, debris etc.
Some discolouration to exterior building surfaces is to
be expected. Adjacent brick or masonry surfaces
should be protected with a rust resistant sheet metal
plate.
9)
Perform regularly scheduled inspections to ensure that
the termination is unobstructed.
10)
Operate the appliance for one heat cycle to ensure
combustion air and vent pipes are properly connected
to the concentric vent termination connections.
CAUTION
Do not operate appliance with the rain cap removed as this
may result in the recirculation of flue products. Water may
also flow into the combustion air pipe and into the burner
enclosure.
Figure 8: Concentric Sidewall Termination
Figure 9: Concentric Vent Sidewall
2.6
Vertical Direct Venting
Location of Vent Termination
1) The total length of piping for venting must not
exceed the limits stated in Table 6.
2) The vent piping must terminate in a 90
o
elbow if
plastic piping is used or in an approved vent cap if
using metal venting. The vent outlet must be at least
1 foot away and 1 foot above from the air inlet
opening which must terminate in a double elbow
facing downwards.
