HVAC

Duct Stiffener

‘S’ Type Stiffener profiles are available in 4 sizes to suit all requirements. Specifically designed EZP corners completes this product range. Our industry leading range now includes a 30mm S2 rated, and 40mm S3 rated stiffener, along with our 40mm S5 (low pressure) and 50mm S5 (medium pressure) rated stiffener. Our new 40mm S5 stiffener design combines performance with an optimised height, and savings can be made with the corner pieces over the previous DVS4 Stiffener System.

  • S TYPE DUCT STIFFENER
    S TYPE DUCT STIFFENER
    • The ‘S’ Type Ductwork Stiffener is fitted to the outside of ductwork between the cross joints to strengthen and stiffen the ductwork whilst also reducing vibration.  Unlike rolled steel angle, the stiffener provides a simple and economical method of stiffening ductwork, without the need for secondary protection.
    • Pre-drilled pilot holes ensure an easier and quicker fitting time by drilling stiffener and ductwork for fasteners in a single operation. Our ‘S’ Type Ductwork Stiffening is also more convenient as it can be fitted after the ductwork jointing system has been fitted.
    • The ‘S’ Type Ductwork Stiffener is manufactured to comply with fig. 19 of the HVCA Specification DW/144. The ‘S’ Type Stiffener profiles are available in 4 sizes to suit all requirements. Specifically designed EZP corners completes this product range.
    • Product reference: DVS2 S2 Rated Stiffener
    • Product reference: DVS3 S3 Rated Stiffener
    • Product reference: DVS4-40 S5 Rated Stiffener *
    • Product reference: DVS4 S5 Rated Stiffener **
    • Product reference: S30C S2 Rated Stiffener Corners x 200
    • Product reference: S40C S3 Rated Stiffener Corner x 200
    • Product reference: S50C S4 Rated Stiffener Corner x 100
    • Available in 5m lengths - 50 lengths/bundle * S5 Low pressure only **S5 Medium pressure only.
  • FACT SHEET - 'S' TYPE STIFFENER PROFILE
    FACT SHEET - 'S' TYPE STIFFENER PROFILE

    These are technical fact sheets covering a few of our products. For further information beyond what you can find in the sheets, then please call our sales office on: +44 1207 288012

What Are Duct Stiffeners?

Duct stiffeners, also known as duct reinforcement profiles, are structural components used to strengthen HVAC ductwork. They prevent deformation and ensure the ducts maintain their shape and functionality under pressure. Doby Verrolec’s duct stiffeners are specifically designed to cater to varying pressure ratings, making them suitable for both low- and medium-pressure systems.

Key Features of Doby Verrolec Duct Stiffeners

1. Versatile Size Options

Our ‘S’ Type Stiffener profiles are available in four sizes to accommodate diverse requirements:

  • 30mm S2 Rated: Ideal for low-pressure systems.
  • 40mm S3 Rated: Enhanced strength for medium-pressure systems.
  • 40mm S5 (Low Pressure): Combines performance with optimised height for cost efficiency.
  • 50mm S5 (Medium Pressure): Provides maximum reinforcement for demanding applications.

2. EZP Corners for Seamless Integration

Specifically designed EZP corners complete our duct stiffener range, ensuring a secure and easy connection between stiffener profiles. These corners streamline installation and improve overall system stability.

3. Performance-Driven Design

Our latest 40mm S5 stiffener combines optimised height with superior performance, delivering robust reinforcement while reducing material costs. The integration of corner pieces offers additional savings compared to the previous DVS4 Stiffener System, making this range more efficient and economical.

 

When to use Duct Stiffeners?

Duct stiffeners play a critical role in maintaining the strength and efficiency of HVAC systems. They reinforce rectangular ducts, ensuring that they retain their shape even when subjected to high airflow or fluctuating pressure conditions. This reinforcement is essential for preventing long-term ductwork damage and maintaining system integrity.

For medium-pressure applications, duct stiffeners provide the necessary support to handle increased stress, enabling reliable operation even in demanding environments. By preventing deformation, they also help ensure consistent airflow throughout the system. This consistency optimises energy usage and reduces strain on HVAC equipment, contributing to better overall efficiency and performance.

Benefits of Doby Verrolec Duct Stiffeners

Our duct stiffeners are engineered to deliver maximum performance while providing unique benefits for installers and end-users.

Durability You Can Rely On - Doby Verrolec duct stiffeners are crafted from high-quality materials that resist wear and tear. They perform exceptionally well in challenging conditions, offering long-lasting support for duct systems.

Simplified Installation - The inclusion of EZP corners ensures that stiffeners connect seamlessly with duct profiles. This design innovation reduces installation time and labour costs, allowing projects to stay on schedule.

Cost-Efficient Design - The optimised height of our 40mm S5 stiffener delivers significant cost savings by reducing material usage without compromising performance. Combined with EZP corners, this makes the system highly economical compared to traditional stiffener designs.

Versatile Applications - Whether your project requires low-pressure reinforcement or medium-pressure support, our stiffeners provide a flexible solution. With four size options and adaptable designs, they meet the demands of various HVAC systems and configurations.

Enhanced System Efficiency - By maintaining the shape and alignment of ductwork, stiffeners prevent airflow disruptions and energy loss. This efficiency reduces operational costs over the lifespan of the HVAC system.

FAQs About Duct Stiffeners

Below are some of the most common questions we come across when it comes to Hvac Duct Stiffeners. If you have a question that isn’t covered below, please get in touch with our team.

What are the benefits of EZP corners?

EZP corners are an essential component in duct stiffener systems, designed to make installation faster and easier. They provide a secure and seamless connection between stiffeners and duct profiles, ensuring the system is both stable and durable. By eliminating complex assembly processes, EZP corners significantly reduce installation time and labour costs. Additionally, they enhance system reliability by improving the strength and rigidity of duct joints, which helps to maintain the structural integrity of HVAC systems even under high-pressure conditions. Their innovative design makes them a cost-effective solution for duct reinforcement projects.

Can Doby Verrolec stiffeners handle custom duct configurations?

Yes, Doby Verrolec stiffeners are specifically engineered for versatility and can be customised to fit non-standard duct sizes or unique configurations. This adaptability allows them to meet the demands of bespoke HVAC projects, where standard stiffeners may not be suitable. Whether the ducts require unusual dimensions or need reinforcement in specific pressure zones, Doby Verrolec stiffeners can be tailored to provide the perfect fit. This flexibility ensures that even highly specialised systems benefit from the same level of durability, stability, and performance as standard installations.

How do stiffeners improve energy efficiency?

Duct stiffeners play a crucial role in enhancing the energy efficiency of HVAC systems by preventing duct deformation. When ducts maintain their intended shape, they allow for consistent and unobstructed airflow throughout the system. This ensures that the HVAC system operates efficiently, minimising the energy required to distribute air. Deformed ducts, on the other hand, can create air leaks and pressure drops, which force the system to work harder and consume more energy. By reinforcing ductwork and maintaining optimal airflow, stiffeners help reduce energy waste, lower operational costs, and extend the lifespan of HVAC equipment.

Why Choose Doby Verrolec for Duct Stiffeners?

Doby Verrolec is a trusted name in the HVAC industry, known for delivering high-quality components that meet the needs of modern projects.

  • Proven Expertise: With decades of experience, we understand the challenges of HVAC installation and provide solutions that address them effectively.
  • Tailored Solutions: Our stiffeners can be customised to match specific project requirements, ensuring the perfect fit every time.
  • Industry-Leading Quality: Every product is manufactured to the highest standards, ensuring reliability and performance in all applications.

 

© Copyright 2025 Doby Cleats Limited. Privacy Policy