Rectangular Welded Air Ducts: A Comprehensive Analysis of Characteristics, Applications, and Installation Techniques

 

I. Product Overview

Rectangular welded air ducts are ventilation ducts widely used in the industrial and construction sectors. They are welded using materials such as stainless steel (e.g., 201, 304, 316L, etc.) or carbon steel (Q235). The thickness of the duct plates can be customized according to project requirements, typically ranging from 0.8mm to 4.0mm, which balances strength and lightweight design. Compared with traditional air ducts, the rectangular structure offers better space utilization, especially suitable for ventilation systems with complex layouts.

 

II. Core Advantages and Features

1. Exceptional Corrosion Resistance: The stainless - steel material endows the air ducts with excellent resistance to chemical acids and alkalis. They can withstand long - term corrosion from corrosive gases (such as chemical waste gases) and have a wide applicable temperature range (-66°C to 149°C).

2. High Strength and Sealing Performance: Using the full - welding process, the welds are free from air and oil leakage. The air - tightness far exceeds that of ordinary seamed air ducts, and they can withstand high - pressure environments (such as laboratory exhaust or high - temperature flue gas transportation).

3. Low - Resistance Design: The smooth inner wall reduces the frictional loss of the airflow, improving the operating efficiency of the system.

4. Multi - functional Adaptability: Customized internal coatings (such as high - temperature - resistant or impact - resistant coatings) are supported. It can transport flammable or corrosive media without the need for additional fire - fighting equipment.

 

III. Application Fields

Thanks to their reliability, rectangular welded air ducts are widely used in the following scenarios:

- Industrial Sector: Exhaust of corrosive gases in semiconductor workshops, chemical plants, and pharmaceutical factories; Oil fume treatment in food processing plants; Dust collection systems in paper mills.

- Construction Sector: Ventilation and smoke - exhaust systems in commercial complexes, hospitals, and laboratories; Air circulation in underground parking lots.

- Special Environments: Explosion - proof exhaust in flammable and explosive places (such as petroleum facilities); Air circulation in cleanrooms with high - cleanliness requirements.

 

IV. Installation and Process Essentials

1. Welding Technology: The argon arc welding process is used, and both longitudinal and transverse welds are fully welded to ensure structural integrity. After welding, acid pickling and passivation treatment are required to remove the surface oxide layer and enhance corrosion resistance.

2. Installation Specifications:

   - Before construction, the design drawings should be checked, and the size and location of the reserved holes should be inspected.

   - The support and hanger should be accurately positioned to prevent the air duct from being deformed under stress.

   - After installation, an air - tightness test (such as a smoke test) should be carried out to ensure no leakage.

3. Maintenance Recommendations: Regularly check the condition of the welds and coatings, and clean the accumulated dust inside the pipes in a timely manner to extend the service life.

 

V. Customized Services

Professional manufacturers can provide comprehensive customized solutions, including:

- Design of non - standard sizes and special - shaped parts to meet special space requirements.

- Optimization of material and thickness combinations to balance cost and performance.

- Standardization of flange interfaces (such as angle - steel flanges or common - plate flanges) to simplify the on - site installation process.

 

With the above characteristics and techniques, rectangular welded air ducts have become the preferred solution that combines functionality and economy in modern ventilation engineering, especially suitable for long - term stable operation requirements in harsh environments.