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Galvanized Square Air Duct Price List | ISO Standard Production - Original Price at Sao Viet Factory

In the construction of mechanical and electrical systems (M&E) for high-rise buildings, industrial factories or commercial centers, square duct plays the role of the “bloodline” of the ventilation and air conditioning (HVAC) system. Choosing a high-precision, airtight and durable ductwork not only determines the operating efficiency but also directly affects the investor’s energy costs.

In Hai Phong and the northern provinces, Sao Viet Air Duct Trading and Manufacturing Company Limited Proud to be a pioneer in applying modern Autoline technology in production, committed to providing square duct products that meet ISO 9001:2015 standards at the most competitive prices directly from the factory.

1. What is Square Air Duct? Structure and Technical Specifications

Square air duct (Rectangular Duct) is an air transmission tool made from galvanized iron or stainless steel, with a square or rectangular cross-section. Its main functions are to supply fresh air (Fresh Air), return air (Return Air), exhaust smoke and dust and ventilate large spaces.

Unlike spiral round ducting, square duct Preferred for use in spaces with low or narrow ceilings thanks to its ability to optimize installation area while still ensuring large air flow.

Standard specifications at Sao Viet:

To ensure durability and strict technical standards (like SMACNA), products at Sao Viet comply with the following parameters:

  • Material: Hoa Sen / Hoa Phat brand galvanized steel (Z080 - Z275) or Stainless steel 201/304.

  • Material thickness: From 0.48mm to 1.2mm (depending on pipe edge size and wind pressure).

  • Standard length: 1100mm – 1200mm (optimized for sheet metal width and transportation).

  • Type of flange connection:

    • Transverse Duct Connector (TDC) The most popular type, seamless flanges made by Autoline machines, are used for medium and large size pipes.

    • Bich C (C-shaped bracket): Used for small size pipes, saving installation space.

    • V-flange (Angle steel): Used for very large size pipes, requiring high stiffness and high pressure resistance.

2. Standard Thickness Table for Square Air Ducts

One of the most important factors when ordering square duct is to determine the correct thickness of the sheet metal to avoid the phenomenon of pipe vibration, noise or distortion when the system operates at high pressure. Below is the reference standard table applied at Sao Viet Air Duct Factory:

Largest side dimension (mm) Recommended sheet metal thickness (mm) Type of flange connection
Below 450 0.48 – 0.58 C-clamp / TDC flange
500 – 1000 0.75 TDC Bich
1100 – 1500 0.95 TDC Bich
Over 1500 1.15 TDC Flange / V Flange

> Note: For emergency smoke extraction systems or fire protection systems requiring EI standards (EI30, EI45, EI60…), the thickness and structure will change to include specialized insulation and fireproof layers.

3. Why Should Square Ducts Be Used In HVAC Systems?

Although round ducts have aerodynamic advantages, square duct still accounts for a large proportion in construction projects thanks to its irreplaceable advantages:

3.1. Optimizing installation space

This is the biggest advantage. In office buildings or apartments, the distance between the false ceiling and the concrete ceiling is often very limited. Square air ducts with flexible width-to-height ratio (e.g. 1000x300mm) can carry the same amount of air as large diameter round ducts but save a significant amount of ceiling height.

3.2. Easy to manufacture and construct

With modern machinery lines at Sao Viet, production time square duct very fast. Construction and installation at the construction site is also more convenient because accessories such as cones, elbows, and square tees are easy to shape and fit into the building structure (usually right angles).

3.3. Various air vents and accessories

Most types of air vents (oval slats, Z slats, diffusers) have a standard square or rectangular design, making the connection to the square pipe more uniform and aesthetic than having to use a complicated conversion box.

4. ISO Standard Square Air Duct Production Process at Sao Viet Factory

In Sao Viet Air Duct, we do not do manual processing. The entire process is automated on the Autoline V and Autoline II lines, ensuring that the product has "100 like one" precision.

  1. Loading materials: The corrugated iron coil (Hoa Sen/Hoa Phat) is fed into the support shaft, the machine automatically pulls and flattens the corrugated iron.

  2. Tendon reinforcement: To reduce noise and increase the hardness of the corrugated iron surface, the machine will roll parallel ribs on the corrugated iron surface.

  3. Cutting the corners and creating the eyelids: The CNC system automatically calculates the size, cuts the 4 corners and runs a double seam (Pittsburg) to lock the tube.

  4. TDC/TDF running: This is an important step. The flange is created right on the pipe body, making the pipe absolutely tight, limiting air leakage much better than the manual method of welding separate flanges.

  5. Fold it into a tube: The hydraulic bending machine will bend the corrugated iron sheet into a complete square tube shape.

  6. Stitching and sealing: Use a seaming machine to lock the longitudinal seam of the pipe. Then, the technician will inject silicone sealant into the flange corners to ensure airtightness according to SMACNA standards.

5. Square Duct Accessories Ecosystem

A complete ventilation system cannot lack the accompanying accessories to redirect the air flow, branch or change the cross-section. Sao Viet provides a complete set of accessories that are processed synchronously:

  • 90-degree square elbow: Used to redirect the flow of air perpendicularly, usually with internal deflectors to reduce pressure loss.

  • Reducer: Convert the pipe cross-section from large to small to maintain pressure when the air flow decreases after passing through the vents.

  • Duct connector / Three-way connector: Divide the main airflow into sub-branches that go into different areas.

  • Shoe foot: Accessories help extract air from the main pipe to the air vent smoothly, reducing noise.

  • Volume Damper: OBD valve or lever valve is used to adjust the air flow in the pipeline.

6. Latest Square Air Duct Price Quote 2024 - 2025

The cost of square duct Depends on fluctuations in steel raw material prices on the market, order size and specific technical requirements.

However, to help customers easily make estimates, Sao Viet Air Duct would like to provide the price calculation formula and basic reference prices:

How to calculate the area of a square air duct (m2):

 

$$S = 2 \times (W + H) \times L$$

 

In there:

  • $W$Pipe width (m)

  • $H$Pipe height (m)

  • $L$: Pipe length (m)

Reference price (At Hai Phong factory):

  • 0.48mm thick corrugated iron: Unit price is about 125,000 - 135,000 VND/m2.

  • 0.58mm thick corrugated iron: Unit price is about 140,000 - 155,000 VND/m2.

  • 0.75mm thick corrugated iron: Unit price is about 180,000 - 195,000 VND/m2.

  • 1.15mm thick corrugated iron: Unit price is about 260,000 - 280,000 VND/m2.

> Note: The prices above exclude VAT, shipping costs, and accessories. To receive the most accurate quote for your project (with significant discounts for large orders), please contact Sao Viet's Hotline directly.

7. Instructions for Proper Installation of Square Air Ducts

Proper installation determines the quality of the 50% system. Below is the standard installation process that Sao Viet technical team applies in projects such as Vinhome Hai Phong or Trang Due Industrial Park:

  1. Prepare: Assemble ductwork and accessories according to shop drawing. Check flange clamps, bolts, threaded rods, and supporting V-bars.

  2. Underfloor installation: It is advisable to connect short pipe sections together to form a longer section (approximately 3-5m) under the floor to reduce the need for working at height.

    • Attach a foam gasket to the flange for sealing.

    • Use flange clips to securely fasten all four corners of the TDC flange.

    • Secure the four corners with bolts to ensure it is firmly in place.

  3. Hanging pipe:

    • Drill and plant expansion bolts into the concrete ceiling.

    • Insert the threaded rod and install the V-shaped pipe support bar (suspension bracket).

    • Lift the assembled pipe section and secure it to the V-shaped support. The distance between the supports is usually 1.5m – 2m, depending on the pipe size.

  4. Leak test: After installation, perform a gas/smoke leak test and apply insulation (if it's a cold air duct).

8. Why Choose Sao Viet Air Ducts in Hai Phong?

Among many mechanical processing units, Sao Viet Air Conditioning Technology Joint Stock Company It remains a name trusted by major contractors such as Coteccons, Ricons, and FDI investors.

8.1. Large-scale factory in Hai Phong

With a large factory located at 267 Le Thanh Tong, May Chai, Ngo Quyen, Hai PhongWe have the capacity to supply thousands of square meters of ductwork per day, meeting the rapid progress of industrial projects.

8.2. On-site measurement services

Unlike other commercial units that only sell products based on available drawings, Sao Viet provides a service of technicians coming to the construction site to measure. This helps:

  • Ensure that the manufactured duct fits snugly into the 100%.

  • We advise on the most optimal pipeline routing plan, avoiding conflicts with electrical/water/fire protection systems.

8.3. Factory direct pricing – No intermediaries

We are a direct manufacturer, importing large quantities of steel coils directly from the steel mill. Therefore, our prices are competitive. square duct At Sao Viet, we are always 10-15% more competitive than other intermediary trading units.

8.4. Typical projects

Sao Viet's reputation has been affirmed through a series of successful projects:

  • Exhaust gas extraction system for Synztec Vietnam Co., Ltd.

  • Construction of ventilation systems for a carton packaging factory in Trang Due Industrial Park.

  • Vinhome Imperia Hai Phong central air conditioning system.

  • Ventilation system at the 22nd Regiment's High-Class Nursing Home in Ha Long.

9. Conclusion

Square air duct is a core component of every modern construction, directly affecting the air quality and human health inside the building. Choosing a reputable manufacturing partner, with technical knowledge and strong supply capacity such as Sao Viet Air Duct This is the first step in creating a quality structure.

Dear customers and electrical and mechanical contractors in Hai Phong, Quang Ninh, and Hai Duong, are you looking for a supplier? square ductFor ductwork accessories and HVAC system installation, contact us today for optimal solutions and the best price quote.

CONTACT INFORMATION – SAO VIET AIR DUCT MANUFACTURING AND TRADING COMPANY LIMITED

  • Factory address: 267 Le Thanh Tong, May Chai, Ngo Quyen, Hai Phong

  • Hotline/Zalo:

    • Mrs. Hang: 0815.999.826

    • Mrs. Giang: 0934.559.168

    • Mrs. Linh: 0949.852.886

      • Tel: 0985.239.838

  • E-mail: vietonggio@gmail.com / dieuhoasaoviet@gmail.com

  • Website: onggiosaoviet.vn - dieuhoasaoviet.vn

Let Sao Viet Air Ducts be your partner in creating healthy and safe living spaces!

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