| Supplier Type | Examples | Risk Level | |----------------|------------|-------------| | OEM Distributor | ebm-papst, Greenheck | Low (genuine) | | Industrial surplus | Radwell, Galco | Medium (tested used) | | Online marketplaces | Amazon, eBay | High (mismatched specs) |
| Specification | Typical Value | |---------------|----------------| | | Double-inlet, forward-curved centrifugal blower | | Wheel Diameter | 158 mm (approx. 6.22 inches) | | Wheel Width | 80–100 mm (depending on revision) | | Material | Galvanized steel or corrosion-resistant aluminum | | Balance Grade | G 2.5 (per ISO 1940-1 for low vibration) | | Max RPM | 2,800 – 3,200 RPM | | Operating Temp | -20°C to +80°C | | Mounting | Set-screw hub or keyed shaft | e b w h - 158