45° Circular Ventilation Bends (Elbows)

Circular 45-degree ventilation bends (elbows) are essential routing components designed to smoothly alter the trajectory of a ducting network. Compared to a sharp 90-degree turn, a 45-degree angle offers significantly lower aerodynamic resistance. For the end user, this feature provides clear operating advantages: it minimizes system pressure drops, reduces air stream turbulence noise, and optimizes fan power consumption, which directly lowers overall energy costs. Our catalog includes factory-manufactured circular bends that undergo automated leak-testing to guarantee continuous airtightness.

Depending on the specific system layout and installation diameters, these elbows are divided into two distinct engineering groups:

• Pressed Elbows: Engineered for small to medium-sized ducting networks from 80 mm up to 200 mm (including the high-demand 150 mm size). Formed via automated deep-drawing, these components are entirely seamless, without transverse joints, providing an ultra-smooth internal surface that maximizes airflow velocity.
• Segmented Bends: Utilized for medium to large-diameter mainlines ranging from 250 mm to 1000 mm. They are assembled from calibrated steel segments joined on automated machinery using robust continuous linear seam welding and tight lock seams, ensuring superior rigidity against static and dynamic pressure.

Design Modifications & Technical Advantages

To match specific project budgets and performance specifications, these components are engineered with premium technical features:

• Certified Raw Materials: Fabricated using premium structural DX51D grade galvanized steel with a continuous zinc protective finish of Z275 (275 g/m²), offering excellent resistance to rust under conditions of standard relative humidity.
• Automated Micro-Gap Stitch Welding: Longitudinal seams of segmented segments are treated with fully automated linear seam welding, leaving the protective properties of the zinc completely intact along the heat-affected line.
• Wall Thickness and Calibration: Selected according to the product diameter to maintain stable geometry of the ventilation line. The main parameters, insertion depth, and bending radius (R = D) are calculated for convenient and reliable coupling with straight duct sections.

Dimensions & Technical Specifications

Our 45-degree ventilation elbows are strictly standardized by product series to ensure a precise match with standard circular ducting systems.

Pressed 45° Elbows (Sizes 80 - 200 mm)

Segmented 45° Bends (Sizes 250 - 1000 mm)

Assembly & Installation Guidelines

The construction of our ventilation bends ensures quick, tool-saving integration into any matching air duct system:

• Standard Male Connection Profile: All elbows feature a calibrated male connection profile (the outer diameter of the collar is sized to slide directly inside a standard spiral or longitudinal duct). To join an elbow directly to another fitting (such as a tee or reducer), a female coupling (sleeve connector) must be used.
• Joint Fixing: The overlapping joint must be secured using standard rivets or self-tapping screws, followed by a layer of self-adhesive aluminum tape to eliminate potential air leakage.
• Secure Packaging: Products are supplied in rigid factory boxes or securely palletized under multi-layer stretch wrap, eliminating structural deformation or job-site contamination during delivery.

Material Properties & Quality Standards

• Premium Raw Material: Fabricated from structural galvanized steel with a stable zinc layer of Z275 (275 g/m²), offering excellent protection against rust in environments with normal humidity.
• Automated Continuous Stitch Welding: Longitudinal seams on segmented elements are joined using automatic micro-gap linear welding, preventing damage to the zinc protection layer at the weld joint.
• Full Compatibility: Dimensional geometry, inner radii ($R = 1 times D$), and installation tolerances strictly adhere to the European standard EN 1506:2007.