Chaff Collector
A cyclone or filter unit that captures the light, papery skins released during roasting.
Overview
Chaff is the dried skin that separates from the bean during roasting. It is light, airborne and highly combustible, which makes collecting it a safety requirement as much as a cleanliness one. A cyclone separates chaff from the exhaust stream before it reaches the fan or the outside air.
Using it well
- Empty after every session rather than when full. A nearly empty collector is not a fire risk.
- Check the cyclone body for a chaff bridge - a clog stops collection without obvious warning.
- Some roasters keep chaff for composting. If you do, store it well away from the roasting area.
Chaff is genuinely flammable. Empty the collector into a metal container, never a plastic bin or bag, and never leave a full collector sitting next to a hot roaster. Let collected chaff cool before disposal.
Why this matters
The chaff collector sits in the cupping & cleaning stage of a roast. Getting it right removes one source of variation, which matters because roasting rewards consistency more than any single clever adjustment. Change one variable at a time, record what you did, and compare batches rather than judging any single roast in isolation.
If you are building a complete setup, start with the instruments that measure what is happening - a probe, a scale and a logger - before buying anything that promises a better result by itself. Measurement first, equipment second.
Educational content. Roast Lab does not sell this or any other product, and we do not accept payment for coverage. Specifications listed above describe typical ranges for the category rather than any specific model, and vary between manufacturers. Always follow the manufacturer instructions and safety documentation supplied with your equipment.
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