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Selection · 5 min read

35 CFM vs. 50 CFM Air Dryers: What Should Decide Your Purchase?

The right size depends on documented capacity at your conditions, not the number in the name. Here is how to decide between a smaller and a larger unit.

The label is not the capacity

Dryers are often marketed by a headline airflow figure. That figure is measured at specific conditions. In a hot shop, or with hot inlet air, the airflow a dryer can handle while meeting its dew point may be lower than the headline number.

Factors that favor the smaller unit

  • Your compressor's delivered airflow is comfortably below the smaller dryer's documented capacity at your conditions.
  • The dryer location stays cool and inlet air is cooled by an aftercooler or piping run.
  • No compressor upgrade is planned.

Factors that favor the larger unit

  • Your delivered airflow is close to the smaller unit's corrected capacity.
  • Summer room or inlet temperatures run high.
  • You expect to add compressor capacity or tools.

Check the costs beyond the dryer

A larger unit can have different electrical requirements, a bigger footprint, and larger connections. Confirm those before treating the larger dryer as the 'safe' choice.

General guidance only, not engineering advice. Confirm sizing and installation with the manufacturer, an authorized distributor, or a qualified technician.

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