Modine DFG 175,000 BTU Duct Furnace Gas-Fired, Indoor, Gravity Vented

Overview

The DFG Series from Modine is a durable, high-performance gravity-vented duct furnace designed for commercial and industrial heating applications requiring dependable, cost-effective operation. Engineered for integration with air handling systems and make-up air units, the DFG Series provides consistent, efficient heat delivery in facilities where simplicity and long-term reliability are essential.

Efficient, Proven Heating Performance

The DFG gravity-vented design utilizes natural draft venting to exhaust flue gases, eliminating the need for a powered venter assembly. This streamlined approach reduces mechanical complexity while delivering dependable performance across a wide range of airflow capacities and input ratings.

Key performance features include:

• Gravity-vented (natural draft) combustion system for simplified venting configurations
• Heavy-duty aluminized steel heat exchangerfor strength and corrosion resistance
• In-shot burners for stable flame characteristics and efficient combustion
• Direct spark ignition with 100% shutoff safety control for reliable startups
• Integrated safety controls, including high-temperature limit protection

With an approximate minimum thermal efficiency of 81%, the DFG Series provides energy-conscious heating suitable for continuous commercial operation.

Designed for Seamless Integration

DFG duct furnaces are built for installation in horizontal duct systems serving:

• Make-up air systems
• Commercial air handlers
• Industrial ventilation systems
• Process air heating applications

The cabinet design allows convenient access to gas and electrical connections, while the internal layout supports simplified maintenance and servicing. Units are compatible with natural gas and can be field-converted to propane when required.

Contractor-Friendly Installation

Because the DFG Series uses gravity venting, installation can be straightforward in applications where vertical venting is available. The absence of a power venter reduces wiring complexity and lowers maintenance requirements over time.

Additional installation benefits include:

• External access panels for serviceability
• Factory-installed ignition and limit controls
• Clearances and mounting configurations suited for commercial mechanical rooms
• Compatibility with standard thermostat controls

Reliable Heating for Demanding Environments

Built for warehouses, manufacturing facilities, distribution centers, retail buildings, and other light industrial spaces, the Modine DFG Series delivers dependable heating performance with fewer moving parts, making it an economical and long-lasting solution for ducted commercial heating systems.

Quick Facts

• 175,000 BTU
• Patented aluminized-steel dimple-tube clamshell heat exchanger for maximum heat transfer
• Blocked vent safety switch to verify proper venting
• Aluminized steel burner with stainless steel separator strip
• Right-hand control access with slide-out burner access
• Single-stage gas controls

Warranty

Modine Indoor Duct Furnaces have a warranty for Heat Exchangers and/or Coils: 1 year (time from date of first beneficial use by buyer or authorized end user) or 18 months (time from date of shipment from seller), whichever occurs first.