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Exhaust Piping
1.
In areas where piping penetrates joist or interior walls,
hole must be large enough to allow clearance on all
sides of pipe through center of hole using a hanger.
2.
When furnace is installed in a residence where unit
is shut down for an extended period of time, such
as a vacation home, make provisions for draining
condensate collection from trap and lines.
Removal of the Furnace from Common Vent
In the event that an existing furnace is removed from
a venting system commonly run with separate gas
appliances, the venting system is likely to be too large to
properly vent the remaining attached appliances.
Conduct the following test while each appliance is operating
and the other appliances (which are not operating) remain
connected to the common venting system. If the venting
VENT PIPE
Capacity
DIA.
(in.)
1-1/2
1
2
045
2-1/2
3
1-1/2
1
2
070
2-1/2
3
2
090
2-1/2
3
2
110
2-1/2
3
135
3
2 inch to 1-1/2 inch reducer required, must be field provided.
1
* Requires field-provided and installed 1-1/2" exhaust accelerator.
** Kit 51W11 is provided with a 1-1/2" accelerator, which must be used for all 45,000 and 70,000 furnace installations. When using
1-/2 in. piping, the pipe must be transitioned to 2 in. pipe when used with the Flush Mount Kit.
† Termination kits 44W92, 44W93, 30G28 and 81J20 approved for use in Canadian installations to meet CSAB149.
†† The 44W92 concentric kit is provided with a 1-1/2" accelerator, which must be installed on the exhaust outlet when this kit is used
with the 45,000 and 70,000 furnaces. When using 1-1/2 in. piping, the pipe must be transitioned to 2 in. pipe when used with the
Concentric Kit.
Page 16 of 60
STANDARD
Outdoor
Outdoor Exhaust
Exhaust
Accelerator
Accelerator
(Dia. X
Length)
Length)
1-1/2" X 12"
2" X 12"
YES
YES
YES
YES
YES
YES
Table 3. Outdoor Termination Kits
system has been installed improperly, you must correct the
system as indicated in the general venting requirements
section.
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
Flush
Mount
(Dia. X
Kit
51W11 *
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Issue 2332
WARNING
CONCENTRIC
1-1/2"
2"
Concentric
Concentric
Kit
Kit
71M80
69M29
or
or
+44W92++
+44W92++
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
3"
Concentric
Kit
60L46
or 44W93+
YES
YES
YES
YES
YES
YES
YES
508404-01
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