CTT | Humidity In Balance

How It Works


Our system takes care of the root cause and is not a temporary fix. The Zonal Dryer™ principle The Zonal Drying™ System effectively removes moisture using established industrial technology. The system takes air from the crown area or cargo area and feeds it through zonal dryer units to remove moisture. It then circulates the dry air between the cabin and the outer skin of the aircraft using a specially designed piccolo duct. This lowers the dew point in the crown area preventing the condensation process from occuring, thus keeping the insulation blankets dry.

Depending on aircraft type, the Zonal Drying™ System consists of one or more zonal dryer units installed at strategic points in the aircraft. Each unit features a slowmoving rotor impregnated with silica gel. A 4-pole inlet fan feeds two separate airstreams into the rotor. The rotor adsorbs humidity from one of the airstreams and processes the air, before releasing it as dry air.

The Zonal Dryer™ Principle

An electric heater warms up the second air stream before it enters the rotor. Passing through the rotor, the heated air absorbs humidity collected from the processed air. The regenerated air is then fed into the aircraft re-circulation system or dumped overboard through the out-flow valve. The system is activated whenever the aircraft is powered up. Furthermore, it is run as on condition with an MTBF of 15 000 flying hours.

The Zonal Drying system keeps the humidity in the crown area at a level where it will reduce the condensation on the fuselage skin inner surface and stop water accumulation in insulation blankets.

The Zonal Drying system includes the following main components:

  • Zonal Dryer
  • Control Panel
  • Filter Box
  • Ducting System