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Applications & Design of UL Listed Stainless Steel Exhaust Systems with Jeremias

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Commercial and institutional projects are putting exhaust systems under more scrutiny than ever—especially when safety, code compliance, and long-term durability are on the line. In this SVL Coffee Break, Chad Sime (SVL Sales Engineer) hosted Connor Rampley, ME (Jeremias National Account Manager, Atlanta, GA) for a deep dive into the applications and design of UL Listed stainless steel exhaust systems, with a focus on what engineers need to specify for grease duct, boiler and gas vent, and engine exhaust.

From material selection, Certifications and real-world installation considerations, the core message was simple: the details of the products joining technology, the system design, and the application’s temperature range paired with the correct material choice determine whether a system performs for decades—or becomes a future liability.

Why UL Listed Stainless Steel Exhaust Systems Matter

Factory-built stainless exhaust systems continue gaining ground because they offer predictable performance and documented testing for high-risk applications. Connor emphasized that “UL Listed” isn’t just a label—it’s evident the system has endured rigorous fire, temperature, pressure, and durability criteria that field-built options often can’t match in real conditions.

For designers and facility owners, that means:

  • Improved life safety and reduced fire risk
  • Better compliance with NFPA/IMC requirements
  • More predictable installation and coordination which cuts down on time and cost.
  • Lower long-term maintenance risk, especially where cleaning is inconsistent

The Big Three Applications: Engine Exhaust, Grease Duct, Boiler Exhaust

Connor structured the presentation around three core categories most engineer’s encounter.

1) Engine Exhaust: Temperature + Pressure Drive the Spec

For engine exhaust systems, Connor highlighted the importance of aligning specifications with applicable codes (NFPA 37 / NFPA 211) and relevant UL requirements (commonly UL 103, and in many cases UL 2561). He also urged engineers to spec performance outcomes—like man-safe skin temperature—instead of prescriptive insulation thicknesses, allowing compliant solutions while protecting personnel.

A key takeaway: if you’re dealing with higher continuous exhaust temperatures, verify the system’s listing and ratings—not every “modular” option in the market is equivalent at elevated temps and pressures.

2) Grease Duct: Design for Reality, Not Best-Case Maintenance

For commercial kitchen exhaust (grease duct), Connor focused on why more projects are moving toward UL 1978 (and UL 2221 for 0-clearance/fire-rated shaft alternatives). The webinar explored practical design issues engineers face every day:

  • Required slope for horizontal grease duct runs greatly varies by system type and listing
  • Access and cleanout strategy matters because cleaning methods can be aggressive
  • Balancing multiple hoods should consider routing and static pressure—not velocity alone

One standout section compared UL-tested performance to typical field-built solutions under fire conditions. The point wasn’t to shame “the way it’s always been done”—it was to reinforce that grease duct design should assume imperfect maintenance and still protect the building.

3) Boiler Exhaust & Gas Vent: Listings, Materials, and Draft Calculations

For condensing boiler exhaust, Connor addressed common specification mistakes—especially around UL 1738-listed materials. He walked through how stainless options such as 444 and 316 can be acceptable under the right listing requirements (depending on the appliance and listing), and why 304 is often misapplied.

He also explained why draft calculations shouldn’t be optional for common-vented systems. Using the ASHRAE chimney design equation alongside NFPA 54 natural draft guidelines can help prevent issues caused by routing changes, added fittings, or wide ambient temperature swings. That design discipline is also what determines when dampers and/or draft fans become necessary—especially on tall stacks or multi-appliance systems.

Stainless Steel Materials: 304 vs 444 vs 316 (What Engineers Need to Know)SWFL Jeremias

Connor fielded direct questions about stainless steel material selection and clarified a practical hierarchy:

  • 304: widely used, but not always a “lifetime” choice depending on application
  • 444 / 316: often preferred for longer life and more demanding environments
  • Outer jackets: selecting an exterior-appropriate stainless can help prevent long-term corrosion issues

Need Help Specifying UL Listed Exhaust, Grease Duct, or Boiler Venting?

SVL can support your team with application guidance, layout coordination, and manufacturer-backed design support for UL Listed stainless steel exhaust systems, including grease duct design, boiler venting, and engine exhaust.

Don’t Miss the Next SVL Coffee Break

SVL Coffee Break is our fast-paced webinar series designed to deliver practical engineering insights for today’s commercial HVAC professionals. Each session features real-world applications, expert perspectives, and actionable takeaways across topics like HVAC systems, indoor air quality, hydronics, and emerging technologies.

Opt-in to SVL marketing emails to receive upcoming Coffee Break invites and on-demand recordings.

Contact SVL Today To Learn More About Jeremias

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                      Jim Lubratt

                      President & Chief Executive Officer

                      Jim Lubratt has been president of SVL since 2006. He first joined the company as a sales engineer in 1992 and was made a partner in 2000. He holds a Bachelor of Science in mechanical engineering from Southern Methodist University and first entered the HVAC industry as a marketing engineer for a heat pump manufacturer in Texas.

                      In addition to his role at SVL, Jim is vice president of AQC Industries, LLC, a manufacturer of specialized underground ductwork systems. He is also an investor and board member for Hydromx, Inc., a manufacturer of heat transfer nanofluids, and Crotega, Inc., creators of personal and building security solutions.

                      Jim and his wife, Tracy, met in college and married in 1993. They have three children, two of whom have graduated college in Texas, while their youngest is attending Grand Canyon University in Arizona.

                      Outside of work, Jim places a priority on his faith, family, friends, and fitness. He enjoys helping people-supporting charities, time with his wife and kids, road-biking with friends and efforts to stay physically fit.

                      A message from Jim on the achievements of SVL

                      SVL started in February 1967 by Charlie Schwab and Craig Vollhaber. Schwab-Vollhaber, Inc. (as it was named at the time) steadily grew and, in 1985, welcomed Paul Lubratt as another partner, becoming Schwab-Vollhaber-Lubratt, Inc. SVL’s founders had the determination to build the most talented, customer-focused HVAC representative in the Midwest. Our original drive and passion still shape the company and culture to this day. The achievements of an organization are the results of the combined efforts of every individual. From humble beginnings, SVL founders paved the way to industry success with hard work and determination. “Today, SVL is strongly organized with great people to lead our industry forward as we are challenged with fast-paced changes to reduce our environmental impact,” says Jim. Now, 55+ years later, SVL is under the leadership of two new principals who share the same vision and drive that has propelled SVL throughout the years. Built on a foundation of integrity, Jim Lubratt, and Charlie Vollhaber strive to ensure opportunities for personal growth, improved work environment, and shared life enrichment. The achievements of our organization are the results of the combined efforts of every individual.

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                      Charlie Vollhaber

                      Executive Vice President & Officer

                      Charlie Vollhaber is a third-generation employee at SVL, as a grandson of company co-founder Craig Vollhaber and son of former CEO Todd Vollhaber. Charlie holds a Bachelor of Science in mechanical engineering and an MBA, both from the University of Minnesota. He became an outside salesman for SVL in 2013, was made a partner in 2019, and then executive vice president and officer in 2022.

                      He grew up playing sports, including football, basketball, golf, and track, and enjoys the competitive nature of the HVAC industry. “I like that no two days are ever the same as there are always questions to answer and problems to solve,” he says. “Most of all, I enjoy working with great people and coordinating together on challenging projects to achieve positive results together.”

                      Outside of work, Charlie enjoys spending time with his wife, Lesley, and their three boys. He’s also fond of golfing, traveling, and attending concerts and sporting events. One of his favorite quotes is from the book of Philippians: “Do nothing from selfish ambition or conceit, but in humility count other more significant than yourselves. Let each of you look not only to his own interests, but also to the interests of others.” Because HVAC and construction is such a team effort, he says, “this mindset helps to create positive results in a vast majority of situations.”

                      A message from Charlie on the culture of SVL

                      “At SVL, we strive to cultivate a unique culture that revolves around finding and empowering exceptional individuals. We believe in equipping our team members with the right tools and resources to succeed.

                      As we’ve grown the business, we have deliberately maintained a small firm culture, fostering an environment where collaboration thrives. We encourage open dialogue and promote a sense of comfort among our employees, allowing anyone to ask questions and seek guidance from anyone else, regardless of their level within the organization.

                      We foster a workshop-like atmosphere where everyone’s contribution is valued. Presenting your work to another individual or a group of teammates provides a platform for collaboration, where ideas are shared, dissected, and improved collectively. We firmly believe in the power of mentoring and provide various avenues for both formal and informal guidance. Whether it’s through structured training programs or casual conversations, we encourage team members to discuss a wide range of topics, from work-related successes or issues to everyday personal life topics.

                      In summary, our culture is built on the foundation of attracting exceptional individuals, empowering them with the necessary tools, and fostering a collaborative environment where mentorship and growth thrive. We are committed to creating an atmosphere where every team member feels supported, valued, and encouraged to reach their fullest potential.”

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                      Al Gramse

                      Vice President of SVL Service Corporation

                      Al Gramse has been in the HVAC industry for over 30 years. He began as a service technician.  Then over his career worked in technical support, building automation, then service manager prior to his current role.

                      How did Al end up in the HVAC industry?  “After high school, I took a couple years to figure out what I wanted to do.   Where I was working at the time, a grumpy old coworker, who I didn’t get along with, walked up to me and said ‘What are you doing here?  Go back to school.’”  I said, “For what?”  He said “There’s a tech school down the street.  Go down there and pick something that interests you”. Then he walked away.  That weird interaction, with someone I didn’t get along with, sent me down a 30-year path in the HVAC industry.   Never underestimate the potential of a little encouragement.   Even if it is from a strange source.

                      Al has been with SVL for 15 years and is the head of our SVL Service division. “The people here are some of the best in the industry,” Al says. “A bunch of team-oriented, knowledgeable, go-getters.” His personal mantra is “figure it out,” “Do a little fact-finding on your own. Use your own brain before you use someone else’s. But know when to ask for help.” he prescribes. “It’s amazing what you can accomplish on your own if you dig in a little bit.”

                      Outside of work, Al has lots of outdoor hobbies, including hunting, fishing, and motorcycling, though his favorite pastime is simply hanging out with family.

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                      Jennifer Roach

                      Director of Marketing, Events & Administration

                      More than just a creative director, Jen brings 30 years of marketing and leadership magic to SVL. Her journey began in the trenches of graphic design, quickly evolving into crafting eye-catching campaigns for iconic brands like Target, Gabberts, Gander Mountain and Camping World. As a seasoned director and agency veteran, she honed her skills with recreational vehicle giant Parts Unlimited before leading creative teams at HOM Furniture and, ultimately, landing at SVL during a crucial growth phase.

                      Jen thrives on "servant-leadership," empowering her team and fostering a culture of trust and mutual respect. "It unlocks their potential, fuels creativity, and leads to work we're all proud of," she says. "I want my team to care, collaborate, and push boundaries together."

                      When not shaping impactful campaigns, Jen enjoys weekend adventures with her husband, Scott, and son, Crew. Their lives are a tapestry of shared passions, from bike rides and baking experiments to cheering on Simley High School wrestlers. And with her recently built forever home in Cottage Grove, her free time now includes a new, thrilling chapter: weekend renovation warrior!

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                      Mike Ruff

                      Vice President of Information Technology

                      Mike Ruff, the Vice President of Information Technology at SVL Inc., is a seasoned professional with an impressive 24-year tenure in the IT industry. His journey in the field is marked by extensive experience and expertise in various domains, including serving as a Cloud Architect focusing on Azure Software as a Service (SaaS), Infrastructure as a Service (IaaS), and both B2B and B2C solutions. Mike’s skills extend to being a Security Architect, where he has honed his knowledge in safeguarding digital assets, and he is also proficient in the Microsoft 365 stack, virtualization, routing, switching, and wireless technologies.

                      Beyond his professional roles, Mike is deeply passionate about technology in all its forms, which is evident in his career and personal hobbies. His love for technology is not just limited to his work but also spills over into his leisure activities. In the summertime, Mike enjoys the thrill of riding his motorcycle, embracing the freedom and adventure it brings. When winter arrives, he switches gears to snowboarding, seeking the excitement and challenge of the snowy slopes. These hobbies reflect Mike’s dynamic personality and continuous pursuit of technically engaging and physically exhilarating activities.

                      Mike Ruff's blend of professional expertise and personal passions make him a unique and valuable asset to SVL Inc., embodying a perfect synergy of technical acumen and a zest for life's adventurous aspects.

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