Comfort-Aire Gas Furnace Model Number Guide and Dimensions

Model Number Breakdown

The model numbers for Comfort-Aire gas furnaces follow a specific structure to denote key features. Below is a breakdown of the components:

G: Indicates the unit is a GAS FURNACE.
UH: Configuration for UPFLOW/HORIZONTAL airflow.
DD: Configuration for DOWNFLOW airflow.
AFUE: Annual Fuel Utilization Efficiency. Common values include 80 (80%), 92 (92%), 95 (95%), and 96 (96%).
Stages/Motor: Indicates the motor type. 'A' signifies a SINGLE STAGE PSC motor, 'C' signifies a SINGLE STAGE CONSTANT TORQUE motor, and 'T' signifies a TWO STAGE VARIABLE SPEED ECM motor.
BTUH Input: Represents the heating input in thousands of BTU per hour (e.g., '045' means 45,000 BTU/hr).
Cabinet Width: Denoted by letters A (14.5" WIDTH), B (17.5" WIDTH), C (21.0" WIDTH), or D (24.5" WIDTH).
Nominal CFM x 100: Indicates cooling capacity in tons (e.g., '3' means 3 Ton Add On Cooling).
Rev Code: Indicates the REVISION level of the model.

For example, a model number like GUH92C045B3M can be interpreted as:

G (Gas Furnace) + UH (Upflow/Horizontal) + 92 (92% AFUE) + C (Single Stage Constant Torque) + 045 (45,000 BTU/hr Input) + B (17.5" Cabinet Width) + 3 (3 Ton Cooling Capacity) + M (Revision Code).

Dimensions (Inches)

The following table provides the physical dimensions (A, B, C, D) for various Comfort-Aire gas furnace models, categorized by airflow configuration.

Model	A	B	C	D
GUH92C045B3M	17-1/2	16-3/8	16	9-5/16
GUH92C070B3M	17-1/2	16-3/8	16	9-5/16
GUH92C090C3M	21	19-7/8	19-1/2	11-5/16
GUH92C090C4M	21	19-7/8	19-1/2	11-5/16
GUH92C110C4M	21	19-7/8	19-1/2	11-5/16
GUH92C110C5M	21	19-7/8	19-1/2	11-5/16
GDD92C045B3M	17-1/2	16-3/8	16	15-1/2
GDD92C070B3M	17-1/2	16-3/8	16	15-1/2
GDD92C090C4M	21	19-7/8	19-1/2	19

Dimensional Views

Visual representations of the furnace dimensions and configurations are provided below.

Front View

This view shows the front of the furnace. Dimension A represents the overall width, and dimension B represents a slightly smaller internal width. The total height of the unit is 33 inches.

Upflow/Horizontal Top View

Depicts the top of an upflow or horizontal airflow furnace. Key dimensions include width D, and lengths such as 24-7/8 inches and 24-3/8 inches. Various ports and panels are visible on the surface.

Downflow Top View

Illustrates the top of a downflow airflow furnace. Dimensions include width D, and lengths such as 25-3/8 inches and 22-5/8 inches. Similar to the upflow view, it shows ports and panels.

Right Side View (Upflow/Horizontal)

This side view details the right side of the upflow/horizontal furnace. It includes various connection points and dimensions such as 1-7/8", 2-5/8", 6-1/2", 1-5/8", 23", 14", 15-1/2", 20-3/8", 20-3/4", and 24". A note indicates a dimension of 26-7/16 inches for the left side.

Right Side View (Downflow)

This view shows the right side of the downflow furnace, with different port configurations and dimensions, including 17-1/2", 9-1/8", 8-7/8", and 6-1/4".

Bottom View (Upflow/Horizontal)

The base of the upflow/horizontal furnace is shown, with width C and a length of 23-1/2 inches indicated.

Bottom View (Downflow)

The base of the downflow furnace is presented, showing width C and a length of 20-1/8 inches.

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