507961-01G / 31-5000653
Page 16 of 57
Issue 2128
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
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:
WARNING
Capacity
VENT PIPE
DIA.
(in.)
STANDARD
CONCENTRIC
Outdoor Exhaust
Accelerator
(Dia. X
Length)
Outdoor
Exhaust
Accelerator
(Dia. X
Length)
Flush
Mount
Kit
1-1/2”
Concentric
Kit
2”
Concentric
Kit
3”
Concentric
Kit
1-1/2” X 12”
2” X 12”
51W11 *
71M80
or
+44W92++
69M29
or
+44W92++
60L46
or 44W93+
045
1
1-1/2
YES
YES
2
YES
YES
YES
2-1/2
YES
YES
YES
3
YES
YES
YES
070
1
1-1/2
YES
YES
2
YES
YES
YES
2-1/2
YES
YES
YES
3
YES
YES
YES
090
2
YES
YES
YES
YES
2-1/2
YES
YES
YES
YES
3
YES
YES
YES
YES
110
2
YES
YES
YES
YES
2-1/2
YES
YES
YES
YES
3
YES
YES
YES
YES
135
3
YES
YES
YES
1
2 inch to 1-1/2 inch reducer required, must be field provided.
* 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 and 44W93 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.
Table 3. Outdoor Termination Kits