G43UF / Page 2
FEATURES
CONTENTS
Blower Data Pages 13−15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dimensions Pages 9−12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust Pipe Venting Information Page 7. . . . . . . . . . . . . . . . . . .
Features and Options Pages 2−4. . . . . . . . . . . . . . . . . . . . . . . . . .
Filter Air Resistance Page 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
High Altitude Information Page 8. . . . . . . . . . . . . . . . . . . . . . . . . .
Installation Clearances Page 8. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Identification Page 1. . . . . . . . . . . . . . . . . . . . . . .
Optional Accessories Selection table Page 6. . . . . . . . . . . . . . . .
Specifications Page 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WARRANTY
Duralok Plus® Aluminized Steel Heat Exchanger − Twenty
years limited warranty.
All other covered components − Five years limited warranty.
Refer to Lennox Equipment Limited Warranty certificate
included with equipment for details.
APPROVALS
Units certified by CSA International and ratings are certified by
GAMA.
Units tested and rated according to US DOE test procedures and
FTC labeling regulations.
Blower data from unit tests conducted in Lennox Laboratory air
test chamber.
Approved by the California Energy Commission and meets
California Seasonal Efficiency requirements and California
Nitrogen Oxides (NOx) Standards.
ENERGY STAR® certified units are designed to use less energy,
help save money on utility bills, and help protect the
environment.
ISO 9001 Registered Manufacturing Quality System.
APPLICATIONS
Input capacities of 44,000, 66,000, 88,000, 110,000, and
132,000 Btuh (12.9, 19.3, 25.8, 32.2, and 38.7 kW).
Energy efficiency (AFUE) up to 92.1%.
Compact cabinet with either side or bottom return air entry.
Lennox add-on indoor coils, high−efficiency air cleaners and
humidifiers can easily be added to furnace.
Shipped factory assembled with all controls installed and wired.
Each unit factory test operated to ensure proper operation.
DIRECT VENT / NON−DIRECT VENT
Furnace can be installed in either Direct Vent or Non−Direct
applications. In Direct Vent applications, combustion air is
supplied from outdoors and flue gases are discharged outdoors.
In Non−Direct Vent applications, combustion air is supplied from
indoors and flue gases are discharged outdoors.
OPTIONS
Termination Kits
Facilitates installation of combustion air intake pipe and flue
exhaust pipe.
Refer to venting table in this bulletin to determine pipe size
needed and proper termination kit required.
See Specifications table and dimension drawings.
Termination Kit − Concentric − Direct Vent Applications
Only
1−1/2, 2, or 3 inch (38, 51, or 76 mm) kit contains concentric
termination assembly, reducer bushing and 45 degree elbow.
Kit requires single hole penetration of roof or wall for installation.
Roof Termination Flashing Kit is available for use with 1−1/2 and
2 inch Kits.
CSA certified.
BDECGFHIMNKJLPOTermination Kits − Wall Assembly
Close Couple − Direct Vent Applications Only
2 or 3 inch (51 or 76 mm) kit consists of close-couple,
side-by-side PVC piping with galvanized steel wall cover plate
for sealing and isolating piping penetration of the wall.
Piping spacing and length is sized for proper wall installations.
CSA certified.
Close Couple WTK − Direct Vent Applications Only
2 or 3 inch (51 or 76 mm) kit contains one insulated faceplate,
one insulated exhaust pipe, elbow and fittings.
Wall Ring − Direct or Non−Direct Vent
2 inch (51 mm) kit contains 2 stainless steel outside seal caps, 2
galvanized steel inside seal caps, 4 seal rings for the caps and
18 inch (457 mm) insulation sleeve for sealing and isolating
intake and exhaust piping penetration of wall.
Maintain a maximum of 6 inches (152 mm) between the inlet
and outlet openings in the installation of the pipes.
Roof Termination Flashing Kit − Direct or Non−Direct Vent
2 or 3 inch (51 or 76 mm) kit contains two neoprene rubber roof
flashings for vertical venting through a roof.
Vent pipe and insulation not furnished. Each kit contains
enough parts for two non−direct vent installations.
Also available for use with 1−1/2 inch (use 2 inch flashing) and 2
inch (use 3 inch flashing) Concentric Vent Termination Kits used
in vertical venting rooftop applications.