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Repair Parts List
The following repair parts are available through Lennox dealers. When ordering parts, include the complete furnace model
number listed on the nameplate −− Example: G61MPVT−36B−070−01.
Cabinet Parts
Upper access panel
Blower access panel
Top Cap
Control Panel Parts
Transformer
Integrated control board
Door interlock switch
Circuit Breaker
Blower Parts
Blower wheel
Motor
Motor mounting frame
Blower housing cutoff plate
Heating Parts
Flame Sensor
Heat exchanger assembly
Gas manifold
Combustion air inducer
Gas valve
Main burner cluster
Main burner orifices
Pressure switches
Ignitor
Primary limit control
Secondary limit control
Flame rollout switches
Combustion air inducer auxiliary limit
Vent Pipe Sizing Worksheet
Proposed vent pipe size : ______
Termination kit catalog number : _____________
Vent pipe equivalency value from table 6 : ______
Total number of 90° elbows required (indoors and outdoors)
______ X 1.5 = ______ equivalent meters of pipe
Total number of 45° elbows required (indoors and outdoors)
______ X .76 = ______ equivalent meters of pipe
Linear feet of straight pipe required : ______
Add equivalent meters of vent pipe listed in
steps 2 through 5.
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
If the total is equal to, or less than, the allowable maximum given in table 6, the proposed pipe size is acceptable. If the
total exceeds the maximum allowed vent pipe length, repeat the process above using the next larger diameter pipe until
an acceptable total is achieved.
NOTE − In Direct Vent systems, total the equivalent length of either the exhaust OR intake piping run, depending upon which
will be LONGER. Intake and exhaust pipe diameter must be the same size and must be terminated in the same pressure
zone. Intake and exhaust pipe should be roughly the same length.
Equivalent Meters
TOTAL
