Cooling Fan
The forced-air unit that pulls ambient air through the cooling tray and out of the beans.
Overview
A cooling fan drives room-temperature air up through the perforated tray and the bean bed. Without adequate airflow, beans cool by conduction alone and the batch can sit hot for a dangerously long time, both for flavour and for the equipment.
Using it well
- Check airflow with your hand over the tray. If you cannot feel it clearly, the batch will cool too slowly.
- Clean the chaff screen every session. A clogged screen is the most common cause of slow cooling.
- Variable speed lets you cool gently at first, which some roasters prefer for delicate light roasts.
Chaff drawn into a fan housing is a fire risk and can unbalance the impeller. Fit and clean a screen, and never run a fan with a damaged guard.
Why this matters
The cooling fan sits in the cooling 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.
Related tools
Roaster Chimney
The exhaust ducting that carries smoke, chaff and combustion gases away from the machine.
Cooling Tray
A perforated tray with a stirring arm that brings a dropped batch down to room temperature fast.
Cupping Bowl Set
Standardised ceramic or glass bowls used for tasting and scoring coffee consistently.
Cupping Spoon
A deep-bowled spoon designed to slurp a sample across the full palate.