Concentric Reducer with EPDM Gasket
Concentric reducer with EPDM gasket is a galvanized steel spiral duct fitting dedicated to smooth diameter conversion between circular ventilation pipelines. Its symmetrical concentric design optimizes airflow path and lowers turbulence for higher system efficiency. Built with durable rust-proof galvanized steel and pre-mounted EPDM rubber seal, this duct reducer ensures leak-tight connections and quick on-site assembly. Optional positive/negative tolerance and a gasketless alternative satisfy different engineering connection standards, supported by a full range of matched diameter sizes. Widely applied in commercial air distribution, industrial fresh air & exhaust pipelines and residential HVAC spiral duct systems.
Product Description
The Concentric Reducer with EPDM Gasket is designed for connecting two round spiral ducts of different diameters in HVAC ventilation systems. Its concentric design ensures a centered airflow transition, helping maintain stable air distribution and reduce turbulence in the duct network.
Manufactured from high-quality galvanized steel, this reducer offers good corrosion resistance, reliable structural strength, and long service life. The integrated EPDM gasket improves airtightness, reduces air leakage, and enables faster installation without additional sealing materials.
Available in multiple diameter combinations, this fitting is widely used in commercial, industrial, and residential ventilation systems. Positive and negative tolerance options are also available to match different duct connection standards.
Key Features
- Concentric Reduction Design Provides smooth airflow transition between different duct diameters
- Integrated EPDM Gasket Improves sealing performance and reduces leakage
- Galvanized Steel Construction Durable, corrosion-resistant, and suitable for long-term use
- Multiple Diameter Options Available in a wide range of size combinations
- Tolerance Options Available Positive and negative tolerances can be selected
- Easy Installation Suitable for fast connection in round spiral duct systems
Applications
- HVAC ventilation systems
- Spiral round duct connections
- Commercial air distribution systems
- Industrial exhaust and fresh air systems
- Air conditioning duct installations
- Residential ventilation networks
Technical Specifications
| Parameter | Value |
| Product Name | Concentric Reducer with EPDM Gasket |
| Model | RCX |
| Material | Galvanized Steel |
| Thickness | 0.5 mm |
| Diameter Range | 100 – 315 mm |
| Connection Type | Slip Fit / Gasket Connection |
| Gasket Material | EPDM |
| Type | Concentric Reducer |
Size Range (Example)
| Size | D (mm) | D1 (mm) | L2 (mm) | H (mm) |
| 100-80 | 98.8 | 78.8 | 50/55 | 40/45 |
| 125-80 | 123.8 | 78.8 | 50/55 | 40/45 |
| 150-80 | 148.7 | 78.8 | 50/55 | 40/45 |
| 160-80 | 158.7 | 78.8 | 50/55 | 40/45 |
| 180-125 | 178.6 | 123.8 | 50/55 | 40/45 |
| 200-80 | 198.6 | 78.8 | 50/55 | 40/45 |
| 250-100 | 248.5 | 98.8 | 50/55 | 40/45 |
| 300-200 | 298.4 | 198.6 | 50/55 | 40/45 |
More sizes are available upon request.
Versions Available
- Concentric Reducer with EPDM Gasket Designed with pre-installed EPDM sealing rings for improved airtightness, reduced leakage, and faster installation.
- Standard Concentric Reducer Standard non-gasket version for conventional duct connections or projects requiring additional on-site sealing treatment.
