Suzhou Rainbow Environmental Equipment Co., Ltd.
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Why choose stainless steel chimneys over traditional materials like brick or galvanized steel?

Stainless steel chimneys offer superior durability, exceptional corrosion resistance (especially against acidic flue gases), longer lifespan, lighter weight for easier installation, and require significantly less maintenance compared to brick or galvanized steel. They also provide excellent thermal performance and structural integrity.


What grades of stainless steel do you use, and why?

We primarily use high-quality grades like 304 (1.4301) and 316/L (1.4401/1.4404) stainless steel. Grade 304 offers excellent general corrosion resistance, while Grade 316/L, with its molybdenum content, provides superior resistance to chlorides and acids, making it ideal for harsher environments or specific fuel types (e.g., biomass). We select the optimal grade based on your application and flue gas conditions.


Can you customize chimneys for specific project requirements?

Yes, absolutely. We specialize in custom-engineered solutions. We can manufacture chimneys to your exact specifications regarding diameter, height, insulation requirements (double-wall, triple-wall), liner material/thickness, support systems, brackets, termination caps, and connection details to integrate seamlessly with your boiler or appliance.


Are your chimneys suitable for high-temperature applications?

Yes. Our stainless steel chimneys are designed to withstand high flue gas temperatures encountered in various heating systems, including industrial boilers, commercial kitchens, and biomass units. We use appropriate grades and construction methods (e.g., insulated systems) to ensure safe and efficient operation at elevated temperatures.


Do your chimneys meet relevant safety and building code standards?

Yes. Our products are manufactured to comply with major international standards such as EN 1856-1 & -2 (European Standard for Chimneys) and relevant sections of International Building Codes (IBC). We can also design to meet specific regional or national codes (e.g., US NFPA 211, UK Building Regulations). Certifications (CE marking, etc.) are provided where applicable.


What insulation options do you offer, and why is insulation important?

We offer single-wall (uninsulated, for interior use only), double-wall (air-insulated), and triple-wall (mineral wool insulated) systems. Insulation is crucial for:


· Maintaining flue gas temperature to ensure proper draft and prevent condensation (acidic condensate can corrode the stack).

· Protecting surrounding structures from excessive heat.

· Improving energy efficiency by minimizing heat loss.

· Meeting clearance requirements to combustibles. We recommend the best system for your specific needs.


What does the installation process involve, and do you provide installation services?

Installation typically involves assembling prefabricated sections, securing support brackets, ensuring proper sealing at joints, and connecting to the appliance. While we primarily manufacture and supply the chimney system components, we can often recommend experienced and certified installation partners in your region or provide detailed installation manuals and technical support to ensure correct fitting.


What kind of warranty do you offer on your products?

We stand behind the quality of our materials and workmanship. We offer a standard one year warranty against manufacturing defects in materials and workmanship under normal use and proper installation. Specific warranty terms and conditions are provided with the product documentation.


How do I determine the correct size (diameter and height) for my chimney?

 Correct sizing is critical for performance and safety. It depends on factors like the appliance type, fuel, heat output (kW/BTU), required draft, flue gas temperature, and building height/structure. We strongly recommend consulting with our technical sales team. Provide us with your appliance specifications and project details, and our engineers will calculate the optimal chimney dimensions.


What is a twist-lock system and how does it work?

Our twist-lock system allows you to quickly and easily install chimneys. It consists of a twist coupling that brings the components together and tightens them (just like sealing a jam jar). We also provide clamping straps for extra fixation. All components are enclosed. This means that the insulation layer is not visible from the outside, preventing soot particles from escaping. The twist-lock system ensures that the fully assembled chimney is more stable.


What are the advantages of stainless steel chimneys?

Rainbow stainless steel chimneys are easy to plan and install. Moreover, they are very stable with an elegant and modern design.

Thanks to their excellent insulating properties, our chimneys can store heat well, allowing your room to reach and maintain the optimal temperature. Since our products are made of pure stainless steel, the chimneys contain no metal components, thus preventing rust.


Where did stainless steel chimneys come from?

The chimney is a tool for exhaust, and stainless steel chimneys are used to expel gases or smoke caused by fire. A stainless steel chimney is a tall structure that discharges smoke into the air, improving combustion conditions.


What are the uses of stainless steel chimneys?

Stainless steel chimneys are mainly used for the emission of exhaust gases from central air conditioning system chillers, gas boilers, kitchen fumes, as well as various industrial process treatment equipment.


Which port is nearest to your plant?

The factory is 147 km away from Shanghai Yangshan Pier, 18 km away from the airport and 16 km away from the high-speed railway station.


What's your delivery time?

We have four production bases in China, which are located in Suzhou headquarters, Chengdu branch, Nantong branch and Tianjin branch, each factory has professional personnel and production equipment, we can complete your chimney system solution in the shortest time.