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Optimal System Protection

Hankison’s DHW Series Wall Mount Desiccant Air Dryers protect moisture sensitive applications requiring low pressure dew points. Delivers dew points of ISO 8573-1: 2010 Class 1 (-100 ºF, -73 ºC) and Class 2 (-40 ºF, -40 ºC) with flow rates of 7 to 50 scfm (12 to 85 nm³/h).
Unit of Measure


Inlet Flow Capacity at -40 ºF (-40 ºC)

N/A 50 scfm85 nm³/h

Inlet Flow Capacity at -100 ºF (-70 ºC)

N/A 40 scfm68 nm³/h

Inlet Connection Size

N/A 3/4 in

Outlet Connection Size

N/A 3/4 in

Inlet Connection Type


Outlet Connection Type



N/A 43.3 in


N/A 24.37 in


N/A 8.54 in


N/A 132 lb

Industry Standards/Certifications

N/A Compressed Air and Gas Institute (CAGI) ISO 8573-1:2010




N/A Hankison®

Dew Points of ISO 8573-1: 2010 Class 1

N/A -100 ºF-73 ºC

Dew Points of ISO 8573-1: 2010 Class 2

N/A -40 ºF-40 ºC

Supreme Craftsmanship

Standard Cord Set Size

N/A 6 ft1.8 m

Furnished in Cabinet for Easy Wall Mounting

  • Fully assembled, piped and wired eases installation.
  • Shipped with desiccant charge.

Front Mounted Control Panel

  • Power on light
  • Tower indicator lights
  • On-off switch

Highly Accurate Solid State Timer

  • Standard 4 minute cycle time delivers ISO Quality Class 2 pressure dew point.
  • Flow deration delivers ISO Quality Class 1 pressure dew point.

Optional NGF Series Filter Packages

  • Grade HF coalescing prefilter captures oil down to 0.008 mg/m³.
  • Grade PF after filter removes solids 1.0 micron and larger.

Technology at a Glance

Technology at a Glance

  • Consistent outlet pressure dew points
  • Slow
  • Minimum purge air usage saves energy.
  • Desiccant beds sized to prevent fluidization plus slow and complete regeneration prevents desiccant aging.
  • Heavy-duty purge exhaust muffler for quiet operation.
  • Non-lubricated, soft seated control valves promotes reliable operation.

How it Works

How it Works

N/A Compressed air enters the dryer and is directed to Tower 1 by valve (A), and then to the dryer outlet through shuttle valve (B). A portion of the dried air is throttled to near atmospheric pressure by means of orifice (C). This extremely dry, low pressure air flows through and regenerates the desiccant in Tower 2 and is exhausted through purge/repressurization valve (D) and exhaust muffler (E) to atmosphere. After a set time, the automatic solid state timer closes purge/ repressurization valve (D) allowing Tower 2 to repressurize slowly. At the end of 2 minutes, valve (A) shifts and purge/repressurization valve (D) reopens.

The main air flow is now dried by Tower 2 while Tower 1 is being regenerated.



N/A Critical applications include labs, hospitals, pharmaceutical manufacturing and other high-tech installations.