Recirculating Indirect Process Air Heater (IAH-R)
Clean Process Air, Heavy-Duty Performance, Maximum Efficiency
Get thermal efficiencies up to 90% with Stelter & Brinck's recirculating indirect air heaters- delivering hot, combustion-free air for high-temperature, high-flow industrial process. Designs up to 900°F process air outlet temperature are standard- call factory for higher temperature requests.
Stelter & Brinck’s recirculating indirect air heater model is best suited for:
- Sensitive processes- provides clean, uncontaminated air- no contact with combustion by-products.
- Fuel cost savings- the re-circulation of hot side combustion air enables higher efficiency and lower operating expenses compared to non-recirculating designs.
- Built for demanding duty- suited for long production runs, high temperatures, and large air volumes.
- Proven reliability- designed with over 100 years of process heating experience.
Stelter & Brinck’s IAH-R-USDA unit is accepted for USDA/ dairy use.
Recirculating Indirect Fired Air Heater
High Pressure IAH-R
"Economizer"- IAH-R with Combustion Air Preheat
Recirculating, Straight-Through, Indirect Fired Air Heater
USDA Dairy Accepted IAH-R
Indirect Fired Air Heater
Custom arranged Indirect Fired Air Heater
USDA-Certificate
FEATURES
Stelter & Brinck Recirculating Indirect Fired Air Heaters are fully packaged systems engineered for maximum performance, reliability, and convenience. Each unit includes hot-side blowers, air heat burners, a heat exchanger, and controls—all prewired, pre-piped, and factory-tested to ensure fast installation and dependable operation.
Our recirculating indirect process air heaters are designed for ease of use, efficient operation, and long service life.
Key Features:
Structural steel, skid-mounted assembly for easy placement and rugged durability
Prewired control enclosure for seamless integration with your DCS or remote operator station
Integrated control panel with:
System annunciator
FM-approved high-temperature limits
Air pressure switches
PID digital temperature control (single or multi-loop)
Flame safety relay
Main power disconnect
Control transformer
Hot-side blower motor starters
UL 508A certification available upon request
Built to meet your standards, including FM, CE, GAP, NFPA, or CSA construction codes
Certified fabrication by AWS D1.1, D1.3, and D1.6 welders
Insulated and skinned combustion chamber for safe and efficient operation
Factory test-fired and tuned before shipment for optimal performance
On-site start-up and ongoing maintenance services available from Stelter & Brinck’s expert technicians
CUSTOM DESIGN OPTIONS:
Stelter & Brinck can engineer your indirect fired air heater to meet your unique process requirements.
Available options include:
Alternate system layouts and configurations
PLC or DCS control interface capability
Process supply blowers and duct transitions
Secondary heat recovery systems for combustion air preheat
Stainless steel construction for corrosive, high-temperature environments, or food applications
ADVANTAGES OF A STELTER & BRINCK INDIRECT FIRED AIR HEATER
Backed by over 100 years of industrial combustion and process heat experience, Stelter & Brinck gas-fired indirect air heaters deliver clean, efficient, and reliable heat for a wide range of industrial applications.
Available in medium-efficiency models for lower initial cost or high-efficiency units (up to 90%) for reduced operating expenses, these systems are built for performance and longevity.
Performance Advantages:
Single-point fuel and power connection for simple installation
Thermal efficiencies up to 90%
High turndown ratio for precise temperature control
Operates over wide process air temperature ranges
Fully proportional process temperature control
Compatible with natural gas or propane (other fuels available upon request)
All-welded heat exchanger, with materials selected for your specific process needs
Clean heat output—products of combustion separate from process air stream
Easy access design for cleaning and maintenance
MODELS
USDA INDIRECT FIRED AIR HEATER (IAH-R-USDA)
Stelter & Brinck’s IAH-R-USDA has been accepted by the United States Department of Agriculture (USDA) Dairy Equipment Review Program under the Dairy Grading Branch Survey Program. Dairy drying plants requiring USDA Dairy Grading accepted equipment can now benefit from clean, high-temperature air delivered by our USDA-compliant indirect fired air heaters.
The IAH-R-USDA utilizes recirculated hot-side combustion air to achieve high thermal efficiency up to 90% and deliver consistent, process-ready heat. Each unit is fully packaged, including hot-side blowers, burner, gas valve train, heat exchanger, and controls, and is built to meet your specific construction standard requirements. Units arrive prewired and pre-piped, ready for fast, straightforward installation.
Key Features:
Flexible layouts – horizontal or vertical designs available to fit your plant’s footprint and process requirements
UL 508A rated enclosure available for electrical safety
Low-emission options for environmental compliance
Factory test-fired and tuned by S&B’s internal quality control team before shipment
On-site start-up and maintenance support available from Stelter & Brinck’s expert technicians
Benefits:
USDA-accepted for use in dairy drying applications
High thermal efficiency and temperature capability
Fully packaged, turnkey system for rapid installation
Reliable, clean indirect heat for sensitive processes
