Allied Air 23U37 Downflow Gas Furnace 90000 Btu 96% Afue

Product Description

The ALLIED AIR 23U37 is a single-stage, downflow natural gas furnace rated at 90,000 BTU/h output and 96 percent AFUE efficiency. It uses a constant torque ECM blower motor to deliver steady, even airflow throughout the heating cycle, reducing temperature swings common with standard PSC motors. The 409 stainless steel primary heat exchanger uses crimped, non-welded construction for long-term durability, while the AL 29-4C stainless steel secondary heat exchanger handles condensate conditions in a high-efficiency system. A silicon nitride ignitor provides reliable hot-surface ignition. This unit is ENERGY STAR certified. Licensed HVAC technicians handle installation and commissioning.

The 23U37 is designed for residential downflow applications where supply air is discharged downward through the floor or a plenum beneath the unit. The cabinet is 21 inches wide with a compact 33-inch height, sized for standardized coil fit with matched cooling equipment. It supports direct two-pipe and non-direct one-pipe venting using standard PVC pipe, and the cabinet accommodates left or right utility connections with zero-step horizontal conversion. The unit is rated for up to 4 nominal tons of matched cooling equipment and carries compliance with California South Coast Air Quality Management District low-NOx requirements, making it suitable for installations in restricted emissions jurisdictions.

Key Features

• 96 percent AFUE single-stage operation with ENERGY STAR certification
• Constant torque ECM blower motor for consistent airflow and enhanced cooling SEER ratings when paired with matched equipment
• 409 stainless steel primary heat exchanger with crimped non-welded construction
• AL 29-4C stainless steel secondary heat exchanger for high-efficiency condensing duty
• Self-diagnostics stores last 10 fault codes independent of power interruption
• Control board includes electronic air cleaner and humidifier terminals
• Certified for direct two-pipe and non-direct one-pipe PVC venting
• Low-NOx compliant for South Coast AQMD jurisdictions

Compatibility

The 23U37 is designed for downflow residential gas furnace installations and is compatible with matched cooling equipment at up to 4 nominal tons. No specific compatible model numbers were provided in the product data.

Installation Notes

Installation must be performed by a licensed HVAC technician in accordance with the National Fuel Gas Code (NFPA 54), local mechanical codes, and the manufacturer installation instructions. Shut off gas supply and disconnect electrical power before any service work. Venting must be installed per the appliance venting tables and local jurisdiction requirements using rated PVC pipe for direct or non-direct configurations. Verify control board wiring connections for accessories such as electronic air cleaners and humidifiers match terminal designations before energizing the unit.

Technical Specifications

• Fuel Type: Natural Gas
• Input/Output Capacity: 90,000 BTU/h
• AFUE Efficiency: 96 percent
• Stage: Single Stage
• Configuration: Downflow
• Nominal Cooling Capacity: 4 tons
• Blower Motor Type: Constant Torque ECM
• Cabinet Width: 21 inches
• Cabinet Height: 33 inches
• Primary Heat Exchanger Material: 409 Stainless Steel
• Secondary Heat Exchanger Material: AL 29-4C Stainless Steel
• Ignition Type: Silicon Nitride Hot Surface
• Venting: Direct Two-Pipe or Non-Direct One-Pipe PVC
• Certifications: ENERGY STAR, South Coast AQMD Low-NOx

Standard Information

• Brand: ALLIED AIR
• Manufacturer Part Number: 23U37