from collecting and freezing.
Do not locate the terminal on the side of the building facing the
prevailing winter winds.
!
CAUTION
Improper location or installation can result in structural
damage to the building, damage to the exterior fi nish of
the building, or may allow recirculation or freezing of the
fl ue gases onto or into the combustion air intake.
Moisture in the fl ue gases condenses as it leaves the termi-
nals. Th
is moisture can freeze on exterior walls, soffi
ts, and
other nearby objects. Some discoloration is to be expected.
Th
e vent terminal should be located no fewer than 6 feet from an
inside corner formed by two exterior walls. A 10 foot distance is
recommended.
Recommended clearance for overhangs is a minimum of 1 foot verti-
cally for each foot horizontally up to 6 feet.
As a protection against freezing, do not expose a 3” x 2” reducing
coupling to outdoor ambient temperatures.
Any adjacent painted surfaces should be in good condition; no
cracks, peeling paint, etc. If wooden surfaces that may be periodi-
cally exposed to fl ue gases are present, consider treating with a sealer
such as Th
ompson’s Water Seal®. Additional information about seal-
ers may be obtained from the Th
ompson’s web site at www.thomp-
sonsonline.com.
Multiple Venting
NOTICE
IMPORTANT: When installing multiple furnaces in close
proximity, each requires dedicated combustion air and
exhaust venting.
COMMON VENTING IS PROHIBITED!!
If two of these furnaces are to be installed in close proximity, the
combustion air intake and exhaust terminations may be installed as
shown in
Figures 13 and 14
.
13 - TERMINATIONS
Figure 13 - Multiple Venting (Standard Horizontal)
Figure 14 - Multiple Venting (Standard Vertical
If more than two furnaces are being installed in close proximity, each
additional combustion air intake and exhaust termination set shall
not terminate less than 12 in (300 mm) apart.
Note:
Canadian installations of 120000 Btuh require 3 ft (900 mm).
!
WARNING
Recirculation of fl ue gases may occur causing the intake
pipe to freeze shut during cold weather operation if the
venting system is not installed per these guidelines.
30” Max.
3” Max.
12” Min. ABOVE
SNOW LEVEL
12” Min.
COMBUSTION
AIR INTAKE
2” PVC
3” Max.
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