Specification

Primary Heat Exchanger
The patented tubular design extracts
heat from combustion gases; made
of aluminized steel, it is resistant to
corrosion and thermal fatigue, and
it’s covered by a lifetime warranty
Draft Inducer
Specially designed for
the tubular heat exchanger,
it pulls hot combustion gases
through the exchanger; heated air is
locked in while cold air is locked out
High Efciency Blower
Three-speed blower delivers warm
air throughout the house quietly and
efficiently; direct drive system has no
belts or pulleys to wear out
Low Prole Cabinet
Steel cabinet has corrosion-resistant
finish; lightweight 34½” high
design saves on space; upflow
model is shown; downflow features
same components in a different
configuration
30 Second Blower Delay
The delay assures a warm duct
temperature at furnace start-up;
blower off settings can be adjusted to
60, 90 120 and 180 seconds
Space Saving, Energy Saving Gas Heat Source
A.F.U.E. Ratings of 92.1 % mean energy savings for you!
In-Shot Burner
Engineered to provide the most
efficient air/gas mixture for
combustion, the design requires no
manual adjustments to regulate the
mix
Hot Surface Ignition
Silicon nitride type igniter is quiet and
automatic, eliminating the need for
a standing pilot light, while offering
improved efficiency
Integrated Furnace
Control
Controls are integrated into
one board set up for fast, easy
installation, also accommodates
air cleaner and humidifier options;
features on-board diagnostics with
easy to recognize fault codes without
counting flashes
Secondary Heat Exchanger
Unique heat recovery coil extracts
additional heat (which would be lost
by less efficient furnaces); stainless
steel construction has a lifetime
warranty
Can be easily converted to LP gas with simple
burner orifice and regulator spring change.
Upflow Models Input BTUH
Heating Cap.
BTUH
AFUE
GUH92A038A3 38,000 35,000 92.1%
GUH92A054B4 54,000 49,700 92.1%
GUH92A072B4 72,000 66,000 92.1%
GUH92A072C5
72,000 66,000 92.1%
GUH92A090C5 90,000 82,800 92.1%
GUH92A108D5 108,000 99,000 92.1%
GUH92A120D5 120,000 110,400 92.1%
CATEGORY IV VENTING:
All models may be vertically or horizontally vented using either a one-pipe or
two-pipe system, for greatest installation flexibility.
Downflow Models Input BTUH
Heating Cap.
BTUH
AFUE
GDD-054B4 54,000 49,700 92.1%
GDD-072B4 72,000 66,000 92.1%
GDD-090C5 90,000 82,800 92.1%
GDD-120D5 120,000 110,400 92.1%
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