3-5 Ton Oil Furnace, Single Stage, Rear Flue Up/Lo-Boy, Variable Speed, 124,000 to 141,000 BTU

Armstrong Air 1.211104 High-Efficiency Oil Furnace – Variable Speed, Rear Flue

The Armstrong Air 1.211104 is a high-efficiency oil-fired furnace engineered for consistent heating performance and long-term durability. With a heating capacity ranging from 124,000 to 141,000 BTU/hr and an 85% AFUE efficiency rating, this model is suitable for residential applications requiring dependable output and energy-conscious operation.

Equipped with a 1 hp variable speed blower motor, the furnace is designed to provide even temperature distribution and improved humidity control across multiple zones. The cabinet features a rear flue outlet and is constructed for service accessibility, supporting efficient installation and simplified maintenance routines.

Product Features

• AFUE: 85% – improves fuel utilization and lowers operating costs compared to older models
• Blower Motor: ECM variable speed – supports quiet operation and optimized airflow
• Cabinet Construction: Heavy-gauge steel with integrated access panels for service efficiency
• Heat Exchanger: High-grade steel heat exchanger built for thermal stability and extended life
• Flue Configuration: Rear flue outlet – 6" diameter for oil-vented applications

Specifications

• Model Number: 1.211104
• Heating Input: 141,000 BTU/hr
• Heating Output: 124,000 BTU/hr
• Voltage: 120V / 60Hz / 1 Phase
• Motor: Variable speed, 1 horsepower
• Dimensions: 37" H × 22.5" W × 52" D

Installation Guidelines

Due to combustion safety, flue venting requirements, and electrical connections, installation of this unit should be performed by a licensed HVAC technician. The rear flue design accommodates retrofit and new construction applications, but attention must be paid to clearances and airflow balancing.

Contractor Considerations

The Armstrong Air 1.211104 is designed to deliver reliable service in residential systems requiring oil heat. Its ECM blower motor allows for integration with high-efficiency air conditioning systems, providing flexibility across climate zones. The cabinet is designed with maintenance in mind, minimizing downtime and simplifying routine service.