Venting - Lennox A97UH2E Installation Instructions Manual

Vent Pipe
Model Dia.
(in.)
1-1/2
1
2
030
045
2-1/2"
3
1-1/2
1
2
70
2-1/2"
3
2
90 2-1/2"
3
2
110 2-1/2"
3
2 inch to 1-1/2 inch reducer required, must be field provided.
1
* Requires field provided end installed 1-1/2" exhaust accelerator.
** Kit 51W11 is provided with e 1-1/2" accelerator, which must be used for all 2 and 2-1/2" PVC installations. When using 1-1/2 in.
piping, the pipe must be transitioned to 2 in. pipe when used with the Flush Mount Kit.
+ Termination kits 44W92, 44W93, 30G28 & 81J20 approved for use in Canadian installations to meet CSA-B149 and ULC S636
++ 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 this furnace. When using 1-1/2 in. piping, the pipe must be transitioned to 2 in. pipe when used with the Concentric Kit.

Venting

Piping Suspension Guidelines
NOTE: Isolate piping at the point where it exits the outside wall or
roof in order to prevent transmission of vibration to the structure.
Wall Thickness Guidelines
Figure 21.
Page 16 of 60
STANDARD
Outdoor Outdoor
Exhaust Exhaust
Accelerator Accelerator
(Dia. X Length) (Dia. X Length)
1-1/2" x12" 2" x12"
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
Table 3. Outdoor Termination Kits Usage
Flush 1-1/2"
Mount Concentric
Kit Kit
71M80 or
51W11
+44W92++
YES YES
YES YES
YES YES
YES YES
YES YES
YES YES
YES YES
YES YES
YES
YES
YES
YES
YES
YES
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 Vent Piping Guidelines section.
Issue 2327
CONCENTRIC
2" 3"
Concentric Concentric
Kit Kit
69M29 or 60L46 or
+44W92++ 44W93+
YES YES
YES YES
YES YES
YES YES
YES YES
YES YES
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