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

A high-efficiency HVAC ventilation system relies not only on high-performance fans and main duct pipes but also on precise matching of duct fittings and irregular customized components. Many engineering projects face construction obstacles such as building structural limitations, cross pipeline conflicts, special airflow adjustment, and non-standard duct sizes. Ordinary standard

Commercial kitchens, restaurants, hotels, and large catering facilities face persistent ventilation challenges: heavy oil fume buildup, lingering cooking odors, high indoor temperature, and noisy fan operation. Ordinary axial fans lack sufficient static pressure to push greasy air through ductwork, while traditional exhaust fans accumulate oil dirt quickly and are hard

In modern HVAC and fire protection engineering, traditional axial fans struggle with insufficient static pressure for long duct systems, while centrifugal fans often consume more power with bulky layouts. Engineers need a balanced ventilation device that delivers large air volume like axial fans and high static pressure like centrifugal fans.

Industrial facilities such as chemical plants, pharmaceutical factories, wastewater treatment plants, and electroplating workshops constantly produce corrosive gas, humid fumes, and peculiar odors. Ordinary metal roof fans are prone to rust, oxidation, and rapid performance degradation when exposed to acid, alkali, and humid environments, leading to frequent breakdowns, high replacement