Duct Air Heaters
Designed to Fit Process Ductwork — Available for Standalone or Integrated Applications
Our industrial direct gas-fired duct air heaters are packaged systems that integrate air heat burners, fuel controls and process controls. Models are available in horizontal or vertical configurations and can be specified for indoor or outdoor applications, based on the requirements of the installation.
Stelter & Brinck duct air heater models can be provided in horizontal or vertical orientation, and indoor or outdoor trim:
- Fresh Air Duct Section: Configured for clean air streams, with or without preheat, and applications with oxygen concentrations above 18%.
- Recirculating Duct Section: Configured for dirty, hot or recirculated air streams where a dedicated combustion air source is required.
- Selective Catalytic Reduction: Low-NOx configurations available for start-up or post-heater applications.
A low-emissions option is available for each of our industrial duct air heater models. These robust units are used independently or in conjunction with dryers, kilns, ovens, furnaces and other heat equipment. Applications include baking, curing, heat treating, printing and many more.
Crossfire Duct Air Heater
Industrial In-Duct Air Heater with Slate Controls
Duct Style Natural-Gas-Fired Air-Heater
Stainless Duct Air Heater
4 Duct Style Process Air Heaters, Tested-In-house
Duct Style Recirculating Process Heater
Duct Style Industrial Process Air Heater
Vertical Up-Fired Duct Air Heaters
FEATURES
Stelter & Brinck industrial duct air heaters are configured for straightforward installation, simplified operation and demanding industrial applications. Each system is built to the specified application requirements and thoroughly tested against established operating conditions before shipment.
Integrated Control Panel – Color touch screen with flame safety relay, first-out annunciator, relays and breakers, alarm horn, local start/stop push buttons, illuminated emergency stop button, indicator lights, FM-approved high-temperature limit, and a PID digital temperature controller (single or multi-loop). UL 508A certification available upon request.
Remote Control Interface – Interfaces with PLC and DCS systems for process monitoring and control.
Custom Construction – Available to applicable FM, CE, GAP, NFPA, or CSA requirements and specified application requirements.
Certified Fabrication – AWS D1.1, D1.3, and D1.6 certified welders for consistent, high-quality construction.
ADVANTAGES OF A STELTER & BRINCK DUCT AIR HEATER:
Backed by more than 100 years of experience in industrial combustion systems, Stelter & Brinck duct air heaters are designed for direct-fired air heating applications where controlled temperature, reliable operation and flexible configuration are important.
High turndown ratio.
Temperature control valve- provides responsive control of process temperature.
Multi-fuel capability – operates on natural gas, propane, or butane (other fuels available upon request).
Factory-tested and tuned to specified operating conditions prior to shipment.
Low-maintenance design- easy access to all major components.
Comprehensive service support– Stelter & Brinck’s expert combustion field service team provides start-up, tuning, and ongoing maintenance.
MODELS
FRESH AIR DUCT SECTION AIR HEATER (AHDX)
Stelter & Brinck AHDX Style Process Air Heaters are designed for direct insertion into process ductwork. Each unit's burner uses oxygen present in the process air stream, eliminating the need for a separate combustion air source.
The AHDX is configured for clean or fresh air applications and can be specified based on the required airflow, temperature and operating conditions.
Key Features:
Steel liner insulated and enclosed with durable steel skinning
Flame observation sight port
Packaged fuel control and safety valve train
Single-point fuel connection to simplify installation
Prewired to a numbered terminal strip for simplified setup
RECIRCULATING DUCT SECTION AIR HEATER (AHDR)
The AHDR Air Heater is built for recirculating industrial process air streams with low oxygen content. Designed for direct insertion into ductwork, this direct-fired, recirculating air heater includes a combustion blower for dependable performance in challenging air environments.
The AHDR can be configured for applications involving a range of inlet and outlet temperatures, subject to specified operating conditions.
Key Features:
Dedicated combustion air inlet
Fully insulated, heavy-duty steel construction
High turndown burner for precise temperature control
Pre-piped and pre-wired fuel valve train
Packaged fuel control and safety system
Single-point fuel connection for easy integration
SELECTIVE CATALYTIC REDUCTION AIR HEATER (SCR)
The Stelter & Brinck Selective Catalytic Reduction (SCR) Air Heater is a low-NOx, direct-fired system designed for use as either a start-up air heater or post-heater (reheater). SCR Air Heaters are commonly used with utility boilers, tail-end SCR configurations, and other systems where NOx is present and flue gas temperature must be increased to meet specified catalyst operating conditions.
SCR start-up heaters can help prevent low-temperature corrosion during boiler startup, while SCR reheaters can help maintain catalyst operating conditions during normal operation.
Key Features:
Operates using available oxygen in the flue gas or an external combustion air source
Designed for demanding operating conditions
Fully packaged, pre-piped and pre-wired to simplify installation
Factory test-fired and tuned to specified operating conditions before shipment
