Duct Flange Corner For HVAC System

What is Duct Corner

The HVAC duct corner is a crucial component in modern ventilation and air conditioning systems. It is designed to connect and reinforce the four corners of a duct flange frame, ensuring secure joints, structural stability, and excellent air tightness between duct sections.

Made from high-quality galvanized steel or stainless steel, the duct flange corner offers outstanding strength, durability, and corrosion resistance. Its precision-engineered design allows for quick installation, reduces air leakage, and improves the overall energy efficiency of the HVAC system.

At Beiouli Metal, we offer a wide range of duct corner types including 30mm, 35mm, 40mm, and 45mm models to match various duct flange sizes. Manufactured from galvanized steel or stainless steel, our duct corners feature high strength, corrosion resistance, and precise dimensions for easy and secure installation.

Advantages of Duct Corner

The HVAC duct corner (also known as a duct flange corner) is designed to provide strong and precise connections at the corners of ventilation duct flanges.

• High Strength and Durability: Made from premium galvanized steel or stainless steel, ensuring excellent rigidity and a long service life.

• Corrosion Resistance: The galvanized duct corner resists rust and oxidation, maintaining performance even in humid or industrial environments.

• Excellent Air Tightness: When combined with sealing gaskets and bolts, it minimizes air leakage, improving overall HVAC efficiency.

• Easy Installation and Standardized Design: Compatible with most duct flange systems, simplifying assembly and reducing installation time.

• Cost-Effective: Reduces maintenance frequency and improves system reliability, lowering long-term operational costs.

Practical Applications & Problem Solving

The duct flange corner is widely used across different HVAC and construction fields, effectively solving key challenges in duct installation and performance.

1. Commercial Buildings (offices, malls, hotels)

• Ensures stable duct connections for large-scale air systems.

• Prevents air leakage, improving air distribution and comfort.

2. Industrial Facilities (factories, workshops, warehouses)

• Provides structural strength for heavy or high-pressure ducts.

• Resists vibration and temperature changes, maintaining system integrity.

3. Public Infrastructure (hospitals, airports, schools, stations)

• Guarantees clean and airtight ventilation in public environments.

• Reduces downtime and maintenance needs in large projects.

4. Residential and Real Estate Projects

• Ensures quiet, efficient air circulation with minimal leakage.

• Reduces installation errors and improves aesthetic finish.

5. Environmental & Fire Protection Systems

• Provides tight sealing for smoke exhaust and air purification systems.

• Withstands high temperatures and corrosion for safer operation.

Duct Corner Customization Range

1. Material Options

Galvanized Steel (Hot-Dip)

Aluminum Alloy (6063-T5)

Stainless Steel (304/316)

2. Size Specifications

• Side Length: 20mm – 50mm (customizable to match duct flange sizes)

• Thickness: 0.8mm – 3.0mm (adaptable to structural requirements)

• Angles: Standard 90°, with customization available for 45° or other angles.

3. Surface Treatment

Hot-Dip Galvanizin

Electro-Galvanizing

Anodizing (for Aluminum)

Powder Coating

4. Certifications & Standards

• ISO 9001 Quality Management System – Consistent manufacturing quality.

• CE Certification – Compliance with European construction standards.

• EN 1505 Standard – European standard for rectangular duct fittings.

Duct Corner  Installation Guide

1. Prepare the Flange Frame: Cut and assemble the duct edges to form the flange profile.

2. Insert the Duct Corner: Place the HVAC duct corner into each of the four flange ends.

3. Fix and Align: Ensure the corners are fully inserted and properly aligned with the frame.

4. Secure with Bolts: Connect adjacent ducts using bolts and gaskets to ensure air-tight sealing.

5. Inspect the Joint: Check for alignment and leakage before final installation.

Duct Corner Manufacturer

Beiouli, established in 2018 and located in Zhejiang, China, is a specialized manufacturer of HVAC duct accessories, including galvanized duct corners, flange hooks, and customized metal fittings.
The company integrates R&D, production, and global sales, offering:

• OEM/ODM customization based on drawings or samples

• Precision stamping and surface treatment (electroplating, coating)

• Full-chain logistics service for global delivery
  With a reputation for quality and reliability, Beiouli Metal is your trusted partner for ventilation duct accessories and custom HVAC components.