| Round duct system
Round Ventilation Bend 90° with Rubber Gasket
Product Description
The round 90° bend (elbow) is a key element for changing the direction of a ventilation route. It connects straight sections of round ducts at a right angle.
To ensure the best performance, we use two different manufacturing technologies:
For small diameters (from 100 to 200 mm), pressed (seamless) bends are used. Thanks to the absence of seams, they feature a perfectly smooth inner surface for minimal air resistance.
Starting from a diameter of 250 mm, bends are manufactured using segmented technology. They are assembled from separate segments using a seam lock. All bends are equipped with a rubber gasket (EPDM) for air tightness class "D".
Key Features and Technology Differences
- Pressed (diameters from 100 to 200 mm): Manufactured by metal stamping and deep drawing. Characterized by perfect geometry and superior aerodynamics.
- Segmented (diameters from 250 mm): Manufactured in our workshop by assembling cut segments. The construction is reinforced with seam locks, ensuring rigidity for large items.
- Air Tightness Class D: Regardless of the technology, the factory-installed EPDM gasket guarantees a tight connection.
- Turning Radius: Standard radius of curvature is R = D (radius equals diameter).
Available Diameters and Specifications
Key parameters of 90° bends with gasket
| Diameter (mm) |
Manufacturing Type |
Weight (kg)* |
Article |
| 80 |
Pressed |
0.27 |
VASLI9080P |
| 100 |
Pressed |
0.35 |
VASLI90100P |
| 125 |
Pressed |
0.52 |
VASLI90125P |
| 160 |
Pressed |
0.83 |
VASLI90160P |
| 200 |
Pressed |
1.27 |
VASLI90200P |
| 250 |
Segmented |
0.69 |
VASLI90250 |
| 315 |
Segmented |
2.56 |
VASLI90315 |
| 355 |
Segmented |
3.01 |
VASLI90355 |
| 400 |
Segmented |
3.85 |
VASLI90400 |
| 450 |
Segmented |
4.61 |
VASLI90450 |
| 500 |
Segmented |
7.65 |
VASLI90500 |
| 560 |
Segmented |
8.58 |
VASLI90560 |
| 630 |
Segmented |
12.74 |
VASLI90630 |
| 710 |
Segmented |
14.72 |
VASLI90710 |
| 800 |
Segmented |
22.04 |
VASLI90800 |
| 900 |
Segmented |
35.10 |
VASLI90805 |
| 1000 |
Segmented |
42.64 |
VASLI908100 |
| 1250 |
Segmented |
- |
VASLI908125 |
* Weight is approximate and may vary slightly depending on the steel batch.
Application and Installation
- Connection: The bend is inserted directly into straight ducts. To connect two bends together, use a female coupling.
- Fixation: It is recommended to use self-tapping screws or rivets, followed by sealing with aluminium tape.
Custom Manufacturing of Segmented Bends
The main advantage of segmented technology is manufacturing flexibility. In our workshop, we can produce bends for any project requirement:
- Non-standard Angles: In addition to standard 90°, 45°, and others, we can manufacture bends with any degree of turn (e.g., 87° or 33°).
- Modified Radius (R): The standard bend has a radius of R = D. Upon request, we manufacture bends with an increased radius (R = 1.5D or R = 2D), which reduces noise and resistance in the system.
- Materials: Manufacturing from stainless steel (AISI 304/316) or aluminium.
- Without Gasket: Segmented bends can be manufactured without a rubber gasket.
Availability and Ordering
- Availability: Standard items (pressed diameters from 100 to 200 mm and segmented from 250 mm) are kept in stock.
- Made to Order: Please check manufacturing times for non-standard segmented bends with our managers.
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