Galvanized Steel HVAC Round Duct Concentric Reducer for Spiral Pipe

• Material: Galvanized Sheet
• Usage: for Air Conditioner, Industrial
• Application: Ventilation
• Shape: Round
• Performance: Corrosion
• Certification: ISO, CE
• Other Material: 201 304 Stainless Steel
• Gi Spiral Duct Material Thickness: 0.5-1.2mm
• Stainless Steel Spiral Ducts Thickness: 0.5-0.8mm
• Fittings: End Cap, Elbow, Reducer Connector, 3 Way, 4 Way
• Transport Package: Shipping Is Usually by Sea LCL Shipment or FCL Shi
• Specification: 100mm-1250mm diameter, length customization
• Origin: Fujian, China
• HS Code: 7326909000

Product Description

 

Product Description

Galvanized Steel Spiral Duct Pipe Reducer

Spiral Ducts Pipe Reducer are essential components in HVAC systems, providing efficient and reliable air distribution. Made from stainless steel or galvanized steel, these air ducts offer excellent durability and corrosion resistance.

The spiral structure promotes smooth airflow with minimal pressure loss, making them ideal for both residential and commercial ventilation applications. Round Spiral Ducts, commonly used in air conditioning and ventilation systems, are valued for their high structural strength and rigidity.

GFI HVAC Main Structural styles For Spiral Duct Supply

SR (Smooth Interior Surface)

Features a smooth interior surface, resulting in minimal friction loss and optimal airflow.

SR2C (Corrugated Exterior with Reinforcements)

This design includes external corrugations with stiffeners, which further enhance the structural strength of the duct.

GFI HVAC ensures each duct is precisely formed and tightly sealed to minimize air leakage and maximize system efficiency.

Product Parameters

D1(mm)	100	150	200		250			300(320)			400
D3(mm)	100	100	100	200	100	200	250	200	250	320	200	250	320	400
L(mm)	160	160	160	330	160	290	350	330	380	450	330	380	465	570
H(mm)	65	95	115	125	140	150	150	182	182	182	225	225	225	225

D1(mm)	500				600(630)			700				800
D3(mm)	200	250	320	400	320	400	500	400	500	630	700	320	400	500
L(mm)	330	380	465	570	465	470	470	470	570	800	980	365	470	570
H(mm)	275	275	275	270	340	340	430	380	380	380	380	430	430	430

D1(mm)	800		900						1000
D3(mm)	630	800	400	500	630	700	810	900	400	500	630	700	800	900
L(mm)	800	990	470	670	800	890	990	1070	470	670	880	890	990	1090
H(mm)	430	430	485	485	485	485	485	485	535	535	535	535	535	535

D1(mm)	1000	1100						/	1250
D3(mm)	1000	500	630	700	800	900	1000	1100	600	700	800	900	100	1250
L(mm)	1190	670	880	870	990	1190	1710	1290	700	890	990	1090	1190	1440
H(mm)	535	585	585	585	585	585	585	585	660	660	660	660	660	660

 

Production Line

Since entering the HVAC industry in 2011, GFI HVAC has evolved from a trading company into a fully integrated manufacturer, continuously investing in advanced production facilities to expand our capabilities. This transformation has enabled us to develop extensive expertise in the manufacturing of spiral ducts, covering a wide range of specifications and applications in modern air duct systems.

Compared to rectangular ducts, spiral ducts offer superior strength, reduced air leakage, and easier installation, making them an ideal choice for modern HVAC systems. In addition, our flexible manufacturing allows for a wide variety of sizes, shapes, and connection options, supporting both standard and customized project requirements.

 

Our product portfolio includes spiral ducts and related fittings (Elbow, 3/4 Way, Reducer,Connector, Clamp) designed for air supply, return, and exhaust applications across various commercial and industrial projects.

Engineered to deliver both structural integrity and aesthetic appeal, our solutions meet diverse project needs - whether focused on efficient airflow, energy-saving performance, or a clean architectural appearance.

GFI HVAC manufactures spiral ducts primarily from galvanized steel and stainless steel materials, utilizing precision forming and automated welding technologies. Our advanced production processes include coil feeding, continuous forming, automatic seam locking, and customized cutting - ensuring consistent product quality and tight dimensional tolerances.

At GFI HVAC, we are dedicated to providing reliable and high-performance spiral duct solutions, backed by years of industry experience and a commitment to manufacturing excellence. Whether you require standard specifications or tailored configurations, our comprehensive production capabilities ensure fast, accurate, and cost-effective delivery for your HVAC projects.

Company Profile

Since 2011, GFI HVAC has been dedicated to the HVAC industry, beginning with galvanized duct (GI duct) and pre-insulated duct manufacturing. Over the past 13 years, we have steadily expanded our operations, establishing and investing in new production facilities to enhance our capabilities.


Today, GFI HVAC operates three duct production line(GI Duct, Spiral Duct, PID Duct) and a dedicated manufacturing site for air vents and dampers. Additionally, we have strategically invested in rubber insulation and flexible duct factories, further strengthening our ability to provide integrated solutions for HVAC projects.


Beyond factories and workers, we also have well-established trade and logistics departments. In business management, GFI HVAC values humanity and shared beliefs. We firmly believe that GFI HVAC is not just a manufacturer but a company driven by human-centric values and a strong collective vision.

Our Advantages

Certificate And Qualification

Our commitment extends beyond manufacturing individual components-we aim to be a comprehensive solutions provider for the HVAC engineering sector.Although our factories specialize in different product lines, they are all aligned with the needs of HVAC projects, particularly those requiring ductwork installation.

This synergy allows us to support contractors, engineers, and distributors with a full range of high-quality HVAC components, ensuring efficiency, durability, and seamless integration in various applications.

GFI HVAC provides advanced HVAC solutions to hospitals, factories, airports, stadiums, commercial complexes, and engineering contractors in over 50 countries worldwide. Additionally, GFI actively participates in international HVAC exhibitions in China, Thailand, Vietnam, and beyond, staying at the forefront of industry trends and fostering deep collaborations with global clients.

At GFI, we are more than just a manufacturer-we are your partner in building a sustainable and efficient future. Let's innovate together and create global value!