Stelter & Brinck Blog

Indirect Fired Air Heaters for Chemically Sensitive Processes


Indirect air heaters are used as the hot air source to dry chemically sensitive products. Indirect fired air heaters are used with fluid bed dryers, spray dryers, ovens, furnaces, flash dryers, rotary dryers, and many other types of process equipment. These air heaters are mainly used to manufacture food, chemicals, pharmaceuticals, and many other products where the taste, look or feel of the end product may be altered by combustion flue gases or particulates.

In order to effectively heat the end product and avoid contamination by the products of combustion, indirect fired air heaters use a heat exchanger to transfer heat to the end product. By using heat exchangers, indirect fired air heaters can provide relatively high thermal efficiencies compared to that of direct fired air heaters.

Stelter & Brinck Indirect Air Heater Models

Does your plant have particulate laden air streams? Do you need to dry a product that is chemically sensitive? Stelter & Brinck’s Indirect Fired Air Heaters are your source for hot air!

Stelter & Brinck’s Indirect Fired Air Heaters are available in recirculating, non-recirculating, & straight- through models.  Our recirculated USDA model is accepted for use in the USDA Dairy Grading Branch Plant Survey Program. In addition, low emissions are an option with all air heater models.

Benefits and Features of Indirect Fired Heaters Designed & Manufactured by Stelter & Brinck

Heavy-Duty, Reliable Design

Designed to Maximize Ease of Use in Your Layout

Fires on Natural Gas, Propane Gas, Mixed Fuel Gasses and Fuel Oils

Packaged Heaters

  • Packaged with hot side blowers, air heat burners, heat exchanger and controls.
  • Rigorously tested & tuned, in-house, prior to shipment.
  • On-site start-up.

High Temperature Capabilities

  • Process air outlet temperatures of up to 1200°F are standard for Stelter & Brinck Indirect Air Heaters; for high temperature requests, call the factory.

High Thermal Efficiency

  • Thermal efficiencies up to 90%, depending upon the application.

Low Emissions Options Available

Plug & Play

  • Non-recirculating or recirculating, horizontal and vertical layouts available.
  • Easy to use and install.
  • Access door options allow for easy cleaning and maintenance.

Case Study: Indirect Fired Air Heater for a Food Manufacturer

The Customer’s Need:

A bulk material dryer in the plant’s Research and Development Lab was in need of a source of hot air. The customer’s boiler did not have sufficient extra capacity and could not achieve the steam pressure required for high heat. Their new equipment was to meet the following qualifications:

  1. Production of clean, hot air – the food manufactured at the plant is chemically sensitive, thus it could not contain the products of combustion.
  2. High efficiency.
  3. Wide operating range.
  4. And capable of handling up to 10 psig process air.

Stelter & Brinck’s Solution:

Stelter & Brinck’s indirect fired air heaters provide clean, hot air free from the by-products of combustion.

For this application, our recirculating model was chosen because it is a high efficiency unit; this indirect air heater is capable of thermal efficiencies of up to 90%. The heater recirculates the hot side air stream thus reducing fuel costs and exhaust volumes to a minimum.

Indirect Fired Air Heater

Indirect Fired Air Heater – Stelter & Brinck

Note the totally enclosed combustion system. This heater is installed on a plant roof-top, the enclosure features full equipment weather protection as well as a built-in lighting source.

Other Pictures of Stelter & Brinck Indirect Air Heaters

Indirect Air Heaters

Stelter & Brinck Indirect Fired Air Heaters

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Ladle & Tundish Dryers & Preheaters for the Metals Industry

What are Tundish & Ladles? Dryers, Preheaters, & Dryer-Preheaters?

The function of ladles and tundishes in the metal industry and the purpose of dryers/ preheaters is discussed below:

Since 3000 B.C. people have been casting and molding metal, originally to make weapons. Today, metal casting and molding is not only used to manufacture weapons, but has grown to include everything from construction structures to automotive parts and art work. Ladle and tundish equipment is very imperative to the casting industry.

Ladles are bowl shaped containers, typically coated with refractory lining, which handle the transfer of molten metal. The ladle pours the molten metal into a tundish, a broad open container with one or more nozzles on the bottom. After the metal cools in the tundish to the perfect casting temperature, it flows through the nozzles into an ingot mold.

Ladle and tundish dryers are used for new refractory linings. Both containers’ linings must be completely dry before production begins in order to ensure that there’s no chance of any water molecules coming into contact with molten metal.

Small variations in the temperature of the molten metal can result in flaws, such as bubbles and cracks, in the final product. In order to prevent temperature loss, ladle and tundish preheaters are used to increase the temperature of the container to be comparable to that of the molten metal.

Dryer-preheaters are a combination unit designed to achieve the high temperatures required for preheating, but include rapid air circulation at lower temperatures required for drying.

Stelter & Brinck Ladle & Tundish Equipment Summary:

Stelter & Brinck’s preheaters & dryers are designed and manufactured for the steel mill industry to provide unmatched performance. Our ladle and tundish dryers are used for fast and even drying at low temperatures. Preheaters are designed to achieve high preheat temperatures and fire on-ratio for the most efficient fuel consumption. Stelter & Brinck tundish & ladle dryer-preheaters are used for high preheat temperatures and fast, uniform drying.

Features & Benefits of Stelter & Brinck Metals Industry Equipment:

Below are other features and benefits of Stelter & Brinck’s durable, reliable and consistant tundish and ladle equipment.

– Horizontal or vertical firing arrangements

– Overhead, lift-off/ portable, tilt-style or horizontal units available

– Multiple burner systems available.

– Easy-to-light & easy-to-use

– Reduces excess energy/ fuel usage

– Completely packaged with burners & controls; prewired and prepiped assembly.

– Control panel includes: annunciator, PID digital temperature control, FM approved high temperature limit, flame safety relay, main power disconnect, control transformer, and process blower motor starter. UL 508A priced per request.

– Remote control interface capability available.

– Built to meet your FM, CE, GAP, NFPA or CSA construction standards.

– Standard units fire on natural gas, but other options are available

– Low emissions options

– Rigorously tested/ tuned and fired in-house before shipment.

-Stelter & Brinck on-site start-up and regular maintenance available.

Pictures of Stelter & Brinck’s Equipment

Metals Industry Equipment

Ladle and Tundish Pictures

Ladle and Tundish Infographic

Tundish & Ladle Infographic- Stelter & Brinck

Tundish & Ladle Infographic- Stelter & Brinck

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Employee Surprised by US Navy Daughter

Enjoy this video of one of our own employees being surprised by his daughter, who is in the US Navy. The father-daughter duo had not seen each other in over 3 months. It was a very special moment for us all at Stelter & Brinck.

We hope everyone had a Happy Memorial Day! We are thankful for everyone who protects our freedom by sacrificing their lives.

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Stelter & Brinck: History, Products & Partnership


Hello! It’s been a while since our last post; we’re updating our blog to provide you with higher quality information with regards to:

  • Company information, updates and news (see below)
  • Stelter & Brinck’s product lines (see below)
  • Stelter & Brinck’s product applications
  • Process heating industry tips and tricks
  • Interesting pictures and projects
  • Customer testimonials
  • White papers
  • Reviews of articles
  • Answers to reader questions
  • And other information regarding Stelter & Brinck, manufacturing and the process heating industry.

Since we’re refreshing our blog, we’d also like to refresh you on our company- Stelter & Brinck- our history, our products and what to expect when working with Stelter & Brinck.

History of S&B

Stelter & Brinck was founded by Henry Stelter & Larry Brinck. S&B was started in 1922 as a manufacturer’s representative agency, selling the first burners and combustion parts. Over time, Stelter & Brinck came to be recognized for their engineering know-how, high quality products and customer service. This led S&B’s numerous customers to look to them for not only their engineering expertise and combustion components, but for equipment sub-assemblies as well. Thus began Stelter & Brinck’s evolution from a manufacturing representative to an original equipment manufacturer.

While Stelter & Brinck still provided parts, S&B began designing and manufacturing larger, more complex equipment in the early 1970’s. It was in 1990’s that S&B introduced combustion field services.

Stelter & Brinck has certainly come a long way, and is looking forward to the future.

S&B’s Repertoire of Process Heat Equipment and Combustion Field Services 

As mentioned in our previous blog, Stelter & Brinck is a supplier of industrial process heat equipment and combustion field services, such as:

  • Indirect Air Heaters: Non-Recirculating, Recirculating (can be built to be USDA compliant), & Straight-Trough Indirect Fired Air Heaters
  • Direct Fired Air Heaters: Duct style and Packaged Industrial Air Heaters
  • Gun Style Process Air Heaters: For gaseous and/or liquid fuels
  • Environmental Systems: Thermal Oxidizers, Catalytic Oxidizers and Afterburners
  • Integrated Packaged Combustion Systems: Skidded and Modular
  • Mill Equipment: Tundish and Ladle Preheaters and Dryers , Scrap Preheaters, Sow Dryers, SEN/SES Preheaters, Paste Heaters, Crucible Ovens and Furnaces
  • Specialty Ovens and Furnaces
  • In-House Equipment Test-Firing: Fuel Oil, Natural Gas, and Propane Testing -Capable of Duplicating Overseas Power
  • Industrial Burner Service: Preventative Maintenance, Safety Audits and Burner Tuning, Combustion System Rebuilds/ Upgrades/ Retrofitting/ Repairs
  • Combustion Systems: Packaged Combustion Systems, Skidded Valve Trains, Control Panels
  • Combustion Equipment Parts

Today, Stelter & Brinck manufactures various lines of process heat equipment and has thousands of units, present in numerous industries. S&B also provides combustion field services and equipment parts to various customers, world-wide. We’re continuously working to improve our products and services, and always looking for new solutions for the process heating industry.

What Should I Expect When Working with Stelter & Brinck?

Selecting an original equipment manufacturer for your process heat equipment can be difficult. There are many factors to take into consideration: What is the OEM’s history in the market? What type of experience do they have? Will the project go smoothly? Will it be done right, on-time? What are their terms & conditions? What value do they provide to your company? Are they easy to work with and get ahold of? Are they open and honest? Do they provide field services? … and the list goes on!

Purchasing equipment obviously isn’t a simple decision. Therefore, Stelter & Brinck has created the following simple 8 Step Project Timeline to give potential customers an idea of what to expect when working in conjunction with S&B. We strive to partner with our customers; you can expect open and honest communication throughout each step listen below.

Step 1: After customer places order, business terms are confirmed and process data is finalized.

Step 2: S&B engineering drawings and plans are submitted to the customer for approval.

Step 3: S&B’s 3D drawings are submitted to the customer for approval.

Step 4: Approved designs are put into manufacture.

Step 5: Equipment is test-fired in-house (S&B’s capabilities: fuel oil/ natural gas/ propane testing, mimic overseas power with in-house generator, test-fire data is logged and recorded).

Step 6: Detailed electronic instruction manual, which includes start-up/ shut-down procedures and a troubleshooting guide, is delivered to customer.

Step 7: Equipment is delivered on-time.

Step 8: S&B’s technicians are able to install and start-up and maintain your new equipment.

Most OEM’s believe once their equipment is running in the field, their job is complete. However, our goal is to deliver the best value by helping our clients to do more business more profitably. In order to meet this goal, Stelter & Brinck offers aftermarket services, so our clients can focus on their core business and rely on us for all of their combustion needs! S&B offers customers field service and parts keep your combustion system operating at peak efficiency after installation and start-up.

For more information about Stelter & Brinck or for questions, feel free to contact us!

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