Coffee Roaster Drum & Chaff Screen is used for forming the perforated drum and chaff collector of coffee roasters so hot air passes the beans while chaff is carried away. NSF is the reference cited for it on drawings, datasheets and purchase orders.
What NSF Means for Coffee Roaster Drum & Chaff Screen
The dimensions in the table below are supplied to suit NSF. Where the standard sets requirements for the finished appliance, device or system, compliance testing of that assembly stays with its manufacturer; we supply the metal mesh part to the drawing and can provide material certificates and dimensional reports with the shipment.
Coffee Roaster Drum & Chaff Screen Dimensions
| Size | Hole diameter (mm) | Pitch (mm) | Thickness (mm) | Open area (%) | Use |
|---|---|---|---|---|---|
| u00d82.0 / P3.5 | 2.0 | 3.5 | 1.0 | 29.6 | Drum shell, 250 g u2013 1 kg |
| u00d82.5 / P4.0 | 2.5 | 4.0 | 1.2 | 35.4 | Drum shell, 1 u2013 5 kg |
| u00d81.5 / P2.5 | 1.5 | 2.5 | 0.8 | 32.6 | Chaff collector |
| u00d83.0 / P5.0 | 3.0 | 5.0 | 1.5 | 32.6 | Cooling tray floor |
Specifying Coffee Roaster Drum & Chaff Screen Beyond the Standard
- Hole size: Below the smallest bean (about 4 mm); 2–2.5 mm is typical.
- Thickness: 1.0–1.5 mm for thermal stability and stiffness.
- Open area: 30–35 % balances airflow and drum strength.
When Coffee Roaster Drum & Chaff Screen Is Not the Right Choice
Not for direct-flame roasting without a solid drum section where uniform conduction is wanted.
