High-temperature flue gas exhaust is a critical part of residential heating, commercial boilers,

power generation and industrial ventilation systems. Single-wall stainless duct often faces

overheating risks, condensation, acid corrosion and limited installation clearance. For MEP

engineers, HVAC contractors and project developers working on international projects,

Stainless Steel Double-Layer Insulated Chimney

In modern commercial and industrial HVAC projects, ductwork quality directly determines airflow efficiency, system stability and long-term operational costs. While stainless steel ducts are premium options for harsh environments, most conventional ventilation, air conditioning and smoke exhaust projects require a durable, airtight, energy-saving and budget-friendly duct solution. This is exactly

For high-standard ventilation projects involving humidity, oil fume, chemical gas, salt fog and strict hygiene requirements, ordinary galvanized ductwork faces inevitable defects: easy rust, short service life, poor oil resistance and secondary pollution. In contrast, Stainless Steel Spiral Duct has become the top upgraded solution for global premium HVAC, industrial

Modern HVAC and ventilation systems often combine square/rectangular main ducts and round branch ducts or fan outlets to balance structural layout, airflow efficiency and ceiling space utilization. However, mismatched duct shapes and sizes easily cause on-site installation obstacles, air leakage, turbulent airflow, and static pressure loss, seriously affecting the overall

Galvanized square duct is the most widely used ductwork in modern HVAC ventilation, smoke exhaust, and industrial air handling systems. For global contractors and engineers, flange connection quality directly determines duct airtightness, installation efficiency, structural stability and long-term system energy efficiency.
We provide two mainstream flange solutions for galvanized

Traditional galvanized steel ducts are widely used in general ventilation projects, yet they face obvious limitations in high humidity, oily, corrosive and coastal salt-fog environments. Prone to rust, air leakage, dust accumulation and short service life, they lead to frequent maintenance, reduced HVAC efficiency and increased long-term project costs. For