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Desiccant Compressed Air Dryers

Desiccant Compressed Air Dryers

Clean and Dry Compressed Air

Compressed air is an important source of energy for industrial applications. The need for an air supply to be clean and contaminant free is crucial. So too is the need for dry air without traces of water or oil vapor. Any form of moisture in a compressed air line has the potential to cause costly downtime, machine damage and product spoilage.

Energy Efficiency

A heatless compressed air system is one of the most important determinants of overall system efficiency and represents one of the largest opportunities for energy savings on any site. There can also be significant cost benefits of an efficiently designed and maintained desiccant compressed air system.

General Air Products’ line of heatless desiccant compressed air dryers offers a multitude of additional energy saving features, which allows the dryer to be linked with a compressor control system and reduces air consumption during periods of low demand.

The HDD Series from General Air Products

With flow rates from 4 scfm to 365 scfm the entire range can operate at -40°F pressure dewpoint as standard, with an option of -100°F for more critical applications. The range has been designed and engineered to meet the air purity class in accordance with ISO 8753:1-2001 (E).

The units have an intelligent diagnostic system installed as standard on each model. Ease of service has been foremost in the design. Each unit can be serviced without disturbing the surrounding pipework. Desiccant cartridges can also be changed out effectively without causing excessive down time.

The compact size of General’s industrial heatless desiccant air dryers ensures that installation is simple and versatile. The units can be installed in small spaces in either a vertical or horizontal position. Models HDD004 through HDD035 can also be floor or wall mounted. Models HDD004 to HDD035 have multiple porting options, with a total of six inlet / outlet connections and many pipework possibilities.

HDD Model Chart

Model Number Connection Size (NPT) SCFM Weight (lbs.)
HDD004 3/8" 4 29
HDD006 3/8" 6 31
HDD008 3/8" 8 33
HDD010 3/8" 10 36
HDD015 3/8" 15 43
HDD025 3/8" 25 53
HDD035 3/8" 35 68
HDD045 3/4" 45 117
HDD055 3/4" 55 130
HDD065 3/4" 65 141
HDD085 1" 85 165
HDD105 1" 105 200
HDD135 1 1/4" 135 225
HDD175 1 1/4" 175 271
HDD215 1 1/2" 215 379
HDD275 1 1/2" 275 423
HDD365 1 1/2" 365 511

NOTE: See cut sheet for dimensions and correction factors

Recognizing the processes operating a compressed air dryer often have differing requirements we have tailored the features of our heatless desiccant compressed air dryers so that they can be utilized to suit various industrial applications. Some of these include:

  • Automotive
  • Power stations
  • Paint Spraying
  • Instrumentation
  • Packaging
  • Pharmaceutical
  • General Industrial
  1. HDD004


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  2. HDD275


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  3. HDD215


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  4. HDD175


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  5. HDD135


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  6. HDD105


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  7. HDD085


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  8. HDD065


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  9. HDD055


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  10. HDD045


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