Flexible Air Duct: Optimal Ventilation Solution, Sao Viet Standard Quotation & Construction

In modern air conditioning and ventilation (HVAC) systems, the choice of ducting material plays a crucial role in determining the performance and lifespan of the structure. Among traditional rigid ducting solutions, flexible air duct It has emerged as a "shining star" thanks to its absolute versatility and ability to work in the most challenging terrains. Sao Viet Air Duct and Sao Viet Air ConditioningWe not only provide products but also offer comprehensive solutions. flexible air duct For all types of construction projects, from civil to industrial, in Hai Phong and neighboring provinces.

The article below will provide the most comprehensive overview of flexible air ductFrom structure, classification, and technical specifications to expert-standard installation procedures, we help you make the most informed choice.

1. What is flexible air duct? An overview of flexible air duct solutions.

Flexible duct Flexible ducts are a specialized material used in the HVAC industry, designed to guide airflow (fresh air, chilled air, exhaust air) from a central unit to air vents or consumption points.

Unlike galvanized sheet metal air ducts (square pipes, spiral round pipes) which have a rigid shape, flexible air duct It has a highly elastic structure, capable of stretching, bending, and curving easily. This property transforms... flexible air duct It has become an indispensable "piece" for connecting main duct sections to air vents (diffusers, grilles) or passing through narrow ceiling spaces with many obstacles that rigid ducts cannot access.

At construction sites by Sao Viet Air Duct construction, flexible air duct Often used at the end of VRV/VRF central air conditioning systems, fresh air supply systems, or sanitary exhaust systems, it ensures airtightness and minimizes vibration transmission from the machinery to the air vents.

2. Detailed structure of high-quality flexible air ducts

To ensure durability and resistance to heat and pressure, a product flexible air duct Standard-compliant materials at Sao Viet are typically constructed from multiple layers of high-quality materials tightly bonded together:

2.1. Aluminum Foil

This is the main outer layer that gives the tube its shape. It typically consists of multiple layers of thin aluminum foil stacked on top of each other, interspersed with layers of transparent polyester resin to increase flexibility and tear resistance. This layer acts as a heat reflector, preventing heat radiation from the external environment from affecting the airflow inside. flexible air duct.

2.2. Steel Wire Helix

To keep flexible air duct Always having a uniformly round cross-section and not deforming when bent, a high-tensile spring steel wire is spirally wound along the length of the pipe. This steel wire acts as a "backbone," helping the pipe withstand wind pressure and maintain its nominal diameter (e.g., D100, D150, D200...).

2.3. Insulation layer (for insulated flexible air ducts)

This is the most important component for distinguishing high-end products. The insulation layer is usually made from glass wool or polyester wool. The standard thickness is typically 25mm with a density ranging from 24kg/m³ to 32kg/m³. This layer helps flexible air duct It prevents condensation (water vapor) from forming on the outside when cold air is being drawn in, while also reducing heat loss.

2.4. Outer Jacket

The insulation layer is protected by a layer of silver-coated aluminum foil or durable PVC plastic. This layer helps to maintain the insulation's shape, prevent moisture and mold from penetrating, and provide protection. flexible air duct Protect from minor physical impacts during construction.

3. Classification of common flexible air ducts on the market

At the warehouse of Sao Viet Air Duct (reference at) onggiosaoviet.vn), we distribute two main product lines to meet the diverse needs of contractors:

3.1. Non-insulated Flexible Duct

• Characteristic: It consists only of an aluminum foil layer and spring steel wire, without any insulation layer.

• Application: Typically used for general ventilation systems, sanitary odor extraction, and factory exhaust gas extraction in places where temperature control (cold or hot) is not required.

• Advantage: The cheapest option among all types. flexible air ductIt is ultra-lightweight and easily folds for transport.

3.2. Insulated Flexible Duct

• Characteristic: It has an additional layer of fiberglass/polyester and an outer silver coating.

• Application: It is mandatory for use in air conditioning (cooling/heating) systems to prevent duct condensation that can damage drywall ceilings. It is also used in systems requiring good sound insulation.

• Advantage: Superior thermal and sound insulation. This is the line. flexible air duct Sao Viet primarily provides consulting services for office buildings and hotels.

3.3. Flexible antibacterial and fire-resistant air ducts

In addition, for specialized projects such as hospitals or cleanrooms, we also provide various types of flexible air duct They are coated with antibacterial nano-layers or use special fire-resistant adhesives, ensuring strict safety and hygiene standards.

4. Technical specifications to consider when making a purchase.

To choose the right type flexible air duct To comply with the technical design, customers should pay attention to the following parameters (standard reference data available at...). dieuhoasaoviet.vn):

• Diameter: Common sizes range from D100, D125, D150, D200, D250, D300, D350, D400 to D500 (mm).

• Length: Standard packaging includes 8-meter or 10-meter rolls, neatly compressed in cardboard boxes (only about 0.8-1.2m long when compressed).

• Operating temperature (Temperature Range): From -30°C to +140°C (for standard types) and up to 250°C for heat-resistant types.

• Maximum airflow velocity: Approximately 30 m/s.

• Working pressure: Up to 2500 Pa.

• Density of insulation cotton: 16kg/m³, 24kg/m³, or 32kg/m³ (the higher the density, the better the thermal insulation and compression resistance).

5. Why should flexible ducting be used in HVAC installations?

The popularity of flexible air duct It's no coincidence. Here are the outstanding benefits that make it an irreplaceable supply:

5.1. Absolute Flexibility

This is the biggest advantage. In buildings with narrow false ceilings, numerous beams, and complex electrical and plumbing systems, running rigid pipes (square/round) to each air vent is impossible or extremely costly in terms of fittings (elbows, bends). Flexible duct This problem is solved by using flexible, undulating curves to navigate through any obstacles and connect to the plenum box.

5.2. Saving on construction costs and time.

Installation flexible air duct Much faster than rigid pipes. No need for millimeter-precise measurements, no need for complex fittings. Just stretch, cut, and connect with clamps (hose). This significantly reduces labor costs for the investor.

5.3. Noise Reduction

Noise from moving airflow or vibrations from equipment (fans, AHUs, FCUs) is a major problem. The soft structure and porous cotton layer of flexible air duct It acts as a natural sound dampener, suppressing sound waves and making the space quieter. This is why the final connection to the air vent is always a... flexible air duct.

5.4. Compact and easy to transport.

A roll flexible air duct A 10-meter-long pipe can be compressed to less than 1 meter, making it very lightweight. Transporting thousands of meters of pipe to the upper floors of a building is much easier than with bulky sheet metal pipes.

6. Sao Viet Technical Standard Installation Guide for Flexible Air Ducts

Umbrella flexible air duct Easy to install, but incorrect techniques can cause significant pressure loss, condensation, or pipe rupture. Based on the practical experience of Sao Viet's technical team, here is the standard procedure:

1. Prepare: Determine the required diameter and length. Note: Do not use. flexible air duct Too long (maximum 3-4m per branch recommended) to avoid wind pressure loss.

2. Connect: Use a stainless steel cable tie (hose clamp) or a high-strength plastic strap to tighten the end. flexible air duct into the airbox or engine casing.

3. Sealing: Wrap the joint tightly with aluminum tape to ensure it is completely airtight. Insulated flexible air ductsTo ensure continuous insulation, smooth out the cotton and foil covering the joint before applying the tape.

4. Suspension support: This is a crucial step that is often overlooked. Flexible duct The pipes must be supported by suspension straps or hangers (usually wide ones to prevent flattening) at appropriate intervals (approximately 1.5m/suspension point). Under no circumstances should the pipes be allowed to sag excessively, as this will obstruct airflow.

5. Check: After installation, check the pipe for kinking or tears in the foil insulation. Curves should be gently bent, avoiding sharp 90-degree bends.

7. Practical applications of flexible air ducts in construction projects.

Product flexible air duct The products supplied by Sao Viet have been used in hundreds of large and small construction projects:

• Shopping malls & Office buildings: Centralized chiller/VRV cooling system connected to a suspended ceiling.

• Luxury Apartments & Villas: The DOAS (Dry Air Supply System) and exhaust system for toilets and kitchens.

• Industrial plant: Local air ducting for work areas, welding fume extraction system, and light dust extraction system.

• Restaurants & Hotels: Ensure a luxurious and quiet space thanks to its sound-absorbing capabilities. flexible air duct.

8. Latest price list for flexible air ducts in Hai Phong (Updated 2024-2025)

Price of flexible air duct This depends on fluctuations in raw material prices (aluminum, steel, fiberglass) and order quantities. However, at Sao Viet Air DuctWe are committed to offering the most competitive prices in the Northern market.

Below is a price range for reference only (Note: Actual prices may vary, please contact the hotline on the website). dieuhoasaoviet.vn (for accurate pricing):

• Flexible air ducts without insulation (D100 – D400): Prices range from 90,000 VND to 350,000 VND per 10m roll.

• Flexible air ducts with fiberglass insulation (D100 – D400): Prices range from 250,000 VND to 650,000 VND per 10m roll.

• Accessories included: Stainless steel cable ties, silver adhesive tape, hanging brackets, etc., are supplied as a complete set.

We offer significant discounts to mechanical and electrical (M&E) contractors, material suppliers, and interior design companies that purchase in large quantities.

9. Common mistakes when using flexible air ducts

Many inexperienced installers often make the following mistakes, which reduces the effectiveness of the work. flexible air duct severely diminished:

• The installation is too long: Draw a line flexible air duct Instead of using rigid sheet metal pipes, use pipes that are 7-8 meters long. This increases pipe resistance, forcing the fan to work overtime, resulting in weak airflow.

• To make the tube bend: Sharp turns restrict airflow, creating an unpleasant whistling noise.

• Do not strain the tubing: To prevent the pipe from sagging and forming "air traps" or areas where water collects, the pipe needs to be stretched to its natural tension of approximately 90% maximum length.

• The outer layer is torn: During the process of pulling pipes through the drywall ceiling, sharp ceiling joists can tear the foil layer. If not repaired, moisture will penetrate and damage the insulation.

10. Why choose Sao Viet Air Duct as your supplier partner?

Among hundreds of suppliers of refrigeration equipment, Sao Viet Air Conditioning Technology Joint Stock Company We proudly affirm our number one position in Hai Phong and the Northern Coastal region.

10.1. Superior product quality

Flexible duct At Sao Viet, quality control is strictly enforced. We use thick aluminum, high-quality elastic steel wire, and insulation cotton with the correct density as promised. We say "NO" to low-quality products, thin insulation, and flimsy, easily torn casings.

10.2. Large Production Capacity & Warehouse Capacity

With a large warehouse system and a modern duct manufacturing plant (as mentioned above). onggiosaoviet.vn), we always have large quantities available flexible air duct Available in all sizes to meet the "lightning-fast" pace of projects.

10.3. In-depth technical consulting

Our engineering team doesn't just sell products, we sell solutions. When you buy... flexible air ductCustomers will receive advice on how to choose the appropriate duct size for their airflow and how to arrange it for optimal results.

10.4. Dedicated after-sales service

• Delivery to construction sites in Hai Phong, Quang Ninh, Hai Duong, Thai Binh, etc.

• Genuine product warranty.

• We offer exchanges or returns if the fault is due to the manufacturer.

11. Frequently Asked Questions (FAQ) about flexible ductwork

Q: Are flexible air ducts as durable as galvanized steel ducts? A: Regarding mechanical strength and lifespan, flexible air duct It cannot compare to galvanized steel tubing. However, if properly installed in a false ceiling environment (not directly exposed to sun and rain), its lifespan can reach 15-20 years.

Q: Should flexible air ducts be insulated with fiberglass or polyester wool? A: Glass wool offers better insulation and is cheaper, but it can cause itching if it comes into contact with the skin during installation. Polyester wool (white wool) is safe, non-itchy, and environmentally friendly, but it is more expensive. The choice depends on the budget and project requirements.

Q: What temperature can flexible air ducts withstand? A: The common type can withstand temperatures up to approximately 120-140 degrees Celsius. If used for high-temperature industrial kitchen exhaust systems or fire protection, a different type is required. flexible air duct Specialized heat resistance (up to 250-400 degrees Celsius).

12. Conclusion

Flexible duct Ventilation is a flexible, efficient, and economical solution, playing a crucial role in the success of HVAC systems. Choosing quality products and proper installation will provide a fresh, cool atmosphere and save energy for your building.

If you are looking for a supplier flexible air duct For a reputable, competitively priced, or professional ductwork installation company in Hai Phong, contact us today! Vietnamese StarsWe are committed to providing complete satisfaction, backed by over 10 years of experience and a strong reputation in the industry.

Contact us now:

• Website: https://onggiosaoviet.vn/ or https://dieuhoasaoviet.vn/

• Product: Square ducting, spiral round ducting, flexible air duct, air vents, dampers and accessories…

• Service: We offer comprehensive design, manufacturing, and installation services.

Let Sao Viet Air Duct Partnering with you for the sustainability of your project!