| Rectangular duct system
Rectangular Galvanized Steel Air Duct
Product Description
A straight section of rectangular air duct with a standard length of 1250 mm is the basic element for building main ventilation channels. The ducts are produced with precise geometry compliance and in accordance with the EN 1505:2000 standard.
This element is the foundation of the ventilation system. It connects with fittings to create a route of any configuration:
We offer both standard square cross-sections and custom manufacturing of any dimensions (WxH) in the range from 100x100 to 2000x2000 mm for specific projects.
Key Features and Materials
- Corrosion protection: DX51D steel grade with Z275 zinc coating (275 g/m²) is used. Such a dense zinc layer provides reliable protection for edges and connection points.
- Structural rigidity: To prevent vibration and noise ("drumming" of walls), ducts of medium and large cross-sections are additionally reinforced with transverse beading (stiffening ribs) and internal rods.
- Flange connection: Sections are joined via Euro-profile (slide-on flange). The flange size (F) is selected automatically based on the duct cross-section to ensure necessary frame rigidity.
- Materials on request: Besides standard galvanized steel, manufacturing from stainless steel (AISI 304, AISI 316) for aggressive environments or powder coating in any RAL color is possible.
Specifications and Available Sizes
Below are the articles for standard square cross-sections. The length of all straight sections is 1250 mm.
Standard range (Square cross-section)
| Size (mm) |
Article |
| 100 x 100 |
VKSTG010010 |
| 200 x 200 |
VKSTG020020 |
| 300 x 300 |
VKSTG030030 |
| 400 x 400 |
VKSTG040040 |
| 500 x 500 |
VKSTG050050 |
| 600 x 600 |
VKSTG060060 |
| 700 x 700 |
VKSTG070070 |
| 800 x 800 |
VKSTG080080 |
| 900 x 900 |
VKSTG090090 |
| 1000 x 1000 |
VKSTG100100 |
Technical production parameters
| Metal thickness |
0.5 mm – 0.9 mm (EN 1505 standard) |
| Connection type (Flange) |
20 mm, 30 mm or 40 mm (depends on side B size) |
| Certification |
CE marking, EN 1505:2000 |
| Production time |
Stock items: check availability. Custom orders: 3–10 business days. |
Installation Recommendations and Accessories
- Joint sealing: To achieve tightness class B or C, the use of sealing tape or specialized sealant around the perimeter of the flange connection is mandatory.
- Route termination: Open duct ends must be closed with end caps (for dead ends) or end caps with mesh.
- Flange fixation: Corners are connected with bolts. If the duct side exceeds 300 mm, it is recommended to install an additional mounting clamp.
- Ceiling mounting: For suspension, use Z-profiles or L-profiles with vibration dampers and threaded rods.
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