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O23 Oil Furnace Up to 83% AFUE
LENNOX’ ELITE® SERIES
Home Comfort Systems
O23
Clean, quiet and comfortable home heating
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INNOVATIVE FEATURES FOR ENHANCED COMFORT AND EFFICIENCY
Heavy-Gauge Steel Heat Exchanger –
Allows air to glide evenly over its smooth surface for
maximum heating efficiency.
Innovative Combustion Chamber –
Constructed from alumina-silica ceramic fiber, provides
quiet operation and high efficiency.
Beckett AFII Burner –
Delivers super-efficient combustion for greater
fuel economy.
Heavy-Duty Fuel Pump –
Provides quiet, reliable operation with fast shutoff of oil flow.
Insulated Blower Compartment –
Minimizes operating sounds.
Durable, Insulated Steel Cabinet –
Built to last and coated with a high-quality paint finish.
O23
Up to
83% AFUE
Elite® Series O23 Specifications
O23 Up-flow
AFUE
Q2/3-70/90
83%
Q3/4-105/120
81%
Q5-140/154
81%
Dimensions HxWxD (in.)
HxWxD (mm)
54 x 19-1/2 x 30-5/8
1372 x 495 x 778
54 x 19-1/2 x 30-5/8
1372 x 495 x 778
54 x 22-1/2 x 33-1/8
1372 x 572 x 841
OF23 Lo-Boy (Rear Flue)
OF23 Lo-Boy (Front Flue)
AFUE
Q3/4-105/120R
Q3/4-105/120
81%
Q5-140/154R
Q5-140/154
81%
OF23Q5-175/210R
80%
Dimensions HxWxD (in.)
HxWxD (mm)
37 x 19-1/2 x 52-1/8
940 x 495 x 1324
37 x 22-1/2 x 52-1/8
940 x 572 x 1324
39 x 24 x 54-3/4
991 x 610 x 1391
OHR23 Down-flow/Horizontal
AFUE
Q3-105/120
81%
Q5-140/154
81%
Dimensions HxWxD (in.)
HxWxD (mm)
59 x 20-1/2 x 20-1/2
1499 x 521 x 521
59 x 23-1/2 x 23-1/2
1499 x 597 x 597
Note: Due to Lennox’ ongoing commitment to quality, all specifications, ratings and dimensions are subject to change without notice.
THIS MODEL
81%-83%
3
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Air conditioner or heat pump
Thermostat
Furnace or air handler
Filtration device
Germicidal light
Indoor coil
Humidifier
HEPA bypass filtration system
Energy recovery ventilator
Supply duct
Return duct
CUSTOMIZE YOUR COMFORT
Lennox® heating, cooling and indoor air quality products are designed to provide efficient, economical comfort—
not only as individual units, but also together as an integrated system. This combined network of products delivers on
every comfort count, from consistent temperatures and balanced humidity to improved indoor air quality.
DEALERS YOU CAN COUNT ON
Choosing the right dealer for your home’s heating, cooling and air quality needs is every bit as important as choosing the
right brand. We think you’ll agree our independent dealers are a big reason you can count on quality customer service
whenever you call. Your Lennox dealer’s dedication to quality shows in his knowledge, training and expertise in designing
the right system for your home, installing it properly and keeping it running perfectly for many years to come.
© Lennox Industries Inc. 2002
(37M95) O23 1/06
PC41274
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