Mild/Black Steel Duct

Mild/Black Steel Duct

This high-strength black steel duct is engineered to withstand the extreme thermal stresses of demanding ventilation environments. Its rugged construction ensures structural integrity during continuous high-temperature exhaust, providing a reliable solution for industrial or heavy-duty commercial applications. The specialized black finish offers enhanced heat dissipation and corrosion resistance, making it an ideal choice for systems requiring both durability and peak performance under pressure.

About the Product

Mild/Black Steel Duct

We manufacture a wide range of Mild Steel duct ranging from 1.50mm to 5.0mm thickness in welded construction. The Mild Steel ducts are commonly used for Kitchen Ventilation & Extract system.
These are manufactured as welded construction complete with MS angle flanges and we are delivered with a single/double coat of red-oxide printer primer paint on the surface area of the duct.
If required for Fire Rated System, black steel ducting can be provided with fire rated coating on the surface area to provide stability and integrity as per fire rating requirement.

Product Features

  • Made from mild steel (MS) – a low carbon steel, making it cost-effective and easy to work with.

  • High strength and durability – suitable for long-term industrial use.

  • Good weldability – allows easy fabrication and customization.

  • Moderate corrosion resistance – often requires protective coatings (e.g., paint, powder coating, or galvanizing).

Applications

  • HVAC ducting for commercial and industrial buildings

  • Fume extraction systems

  • Dust collection systems

  • Kitchen exhaust systems (when coated)

Available Specifications

  • Rectangular Ducts
    Standard sizes: customizable based on design, e.g. 200mm × 200mm up to 1000mm × 1000mm

  • Round Ducts
    Standard diameters: 100mm, 150mm, 200mm, 300mm, etc.

  • Spiral Ducts
    Available from 80mm to 1500mm diameter (customizable)

Why Choose Us?

With a commitment to engineering excellence and fire safety innovation, Firmac is a trusted provider of ducting systems across the Middle East. Our fire-rated ducts offer peace of mind in environments where safety is non-negotiable. By integrating advanced materials with rigorous testing standards, our systems ensure maximum containment and structural stability during critical events. This dedication to high-performance protection makes Firmac an essential partner for large-scale infrastructure and high-occupancy developments throughout the region.

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