General Electric nf80d045s3a Gas Furnace 45K Btu 80% Afue

Product Description

The GENERAL ELECTRIC nf80d045s3a is a single-stage downflow gas furnace rated at 45,000 BTU/h with an 80% AFUE efficiency rating. It uses a constant torque motor for consistent airflow delivery and features crimped heat exchangers rather than welded construction. Pre-formed flanges and Insta-Position Technology simplify installation positioning during rough-in. This unit is designed for residential forced-air heating systems and is installed by licensed HVAC technicians. The gray cabinet finish and compact footprint make it suitable for utility closet and alcove applications where downflow air discharge is required.

This furnace is configured for downflow airflow, directing conditioned air downward into the supply plenum or subfloor duct system. It is sized at 3 tons of air-handling capacity and rated for standard emissions levels, making it appropriate for residential installations in most jurisdictions. Typical applications include single-family homes and light commercial spaces where a single-stage heating system meets the load requirement. Licensed HVAC professionals handle sizing, venting, and commissioning of this unit.

Key Features

• 45,000 BTU/h heating output at 80% AFUE efficiency
• Single-stage operation for straightforward control integration
• Constant torque motor for stable, consistent airflow across static pressure variations
• Crimped heat exchangers eliminate weld-joint failure points
• Pre-formed flanges with Insta-Position Technology for faster field installation
• Downflow air discharge configuration for subfloor or under-unit duct systems

Compatibility

Designed as an OEM-style downflow gas furnace for residential forced-air heating systems requiring a single-stage, 80% AFUE unit with downflow discharge.

Installation Notes

Installation must be performed by a licensed HVAC technician in accordance with local codes and the applicable edition of the International Fuel Gas Code (IFGC). Shut off gas supply and disconnect electrical power before servicing or replacing any components. Proper venting must be verified for flue gas exhaust per manufacturer guidelines and local authority having jurisdiction. Do not attempt to modify the heat exchanger, burner assembly, or gas valve without manufacturer authorization.

Technical Specifications

• Product Type: Gas Furnace
• Heating Output: 45,000 BTU/h
• AFUE: 80%
• Heating Stages: Single-Stage
• Airflow Direction: Downflow
• Tonnage: 3 Ton
• Motor Type: Constant Torque
• Emissions Level: Standard
• Color: Gray
• Overall Height: 33 inches
• Overall Width: 14.5 inches
• Overall Depth: 28.5 inches
• Net Weight: 110 pounds
• Approximate Shipping Weight: 120 pounds
• Parts Warranty: Limited 5-year entire appliance; Limited 10-year entire appliance with registration; Limited 20-year heat exchanger; Limited lifetime heat exchanger with registration
• Labor Warranty: No Warranty

Standard Information

• Brand: GENERAL ELECTRIC
• Manufacturer Part Number: nf80d045s3a