MSW Single Wall Positive Pressure Chimney System
A UL-listed, factory-built single-wall venting system engineered for negative, neutral, and positive pressure applications. The system features a precision-engineered flanged connection with V-band clamps, allowing for fast, secure, and efficient installation while maintaining a durable leak-resistant joint. Constructed from 100% stainless steel, the modular design provides long-lasting performance, simplified assembly, and dependable service backed by a lifetime warranty.
- UL 1777, UL 103, UL 2561, and UL 1738 listed
- 1400°F continuous / 1800°F intermittent temperature rating
- Available in diameters from 6" through 48"
- 100% stainless steel — choose from 304, 316L, 444, or AL29-4C
- Complete library of UL-approved fittings and accessories
- Lifetime warranty
Boilers & Water Heaters
Engine and CHP exhaust
Grease Duct
Chemical & Pharmaceutical
Waste & Recycling
Food Processing
Dryer vents,
Oven and process stacks
paint booth exhaust
The MSW Series is a factory-built, single-wall chimney and venting system designed for demanding commercial and industrial applications. Engineered to perform under negative, neutral, and positive pressure conditions, MSW delivers reliable performance across a wide range of fuel types and installation scenarios.
Industries & Applications
Category I Gas Appliances
Oil-Fired Appliances
Dual Fuel Systems
Special Gas Vent
CHP (Combined Heat & Power) Venting
Generator Exhaust
Fireplace Systems
Ideal For
Breeching systems
Chimney relining
New construction
System extensions and retrofits
Fuel Compatibility
Suitable for Category I gas, oil, dual fuel, and special gas applications.
Built to the Highest Standards
Tested and Listed to UL 1777 for Category I gas and oil-fired appliances
Tested and Listed to UL 103 and UL 2561
Tested and Listed to UL 1738 Special Gas Vent Standard
Engineered for Performance
1400°F continuous temperature rating
1800°F intermittent temperature rating
Performs under negative, neutral, and positive pressure
Available in diameters from 6″ through 48″
Premium Materials
100% stainless steel supports, hardware, and components
Mill-certified stainless steel grades available: 304, 316L, 444, and AL29-4C
Complete library of UL-approved fittings and accessories
Backed for Life
Lifetime Warranty
UL-listed factory-built construction
Trusted by contractors, architects, and engineering firms nationwide
Engineering & Support Included
Technical support for contractors, architects, and engineering firms
Complete design assistance, drafting, and structural calculations
Expert solutions for complex job-site challenges
Industry-leading fabrication turnaround
Rush production available for same-day installations
Dedicated support team to keep your project moving
Material
Manufactured from minimum 20-gauge (0.0359″) stainless steel for superior durability and corrosion resistance.
Available in mill-certified stainless steel grades:
304, 316L, 444, AL29-4C
100% stainless steel construction, including supports, hardware, and all components.
Sizes
Available in round configurations from 6″ to 48″ in diameter. Custom sizes and configurations available — contact our engineering team.
Temperature Ratings
Continuous: 1400°F
Intermittent: 1800°F
Pressure Rating
Suitable for negative, neutral, and up to 90” WC positive pressure applications.
Listings & Certifications
UL 1777 — Category I gas and oil-fired appliances
UL 103 — Factory-built chimneys
UL 2561 — Chimney liners
UL 1738 — Special Gas Vent Standard
Construction
Factory-built single-wall design
UL-listed fittings and accessories available
Suitable for breeching, relining, new construction, and retrofit applications
Warranty
Lifetime Warranty
Need help specifying your system?
Our in-house engineering team provides complete design assistance, structural calculations, and drafting support for projects of any scale.