+44 203 286 8189 steve.jones@westside-int.com

Product Update

Rosahl micro dehumidifier range is extended

Westside International announced the Rosahl micro dehumidifier range is extended with the introduction of the new Rosahl M-Series micro-dehumidifier membranes to its product range.  Unlike the plastic mounting used in the original MDL-Series, the M-Series offers simplified installation by using pre-drilled stainless steel mounting frames,  The range has been extended with the addition of models with enclosure capacities now from 250 litres up to 4.  The MDL-Series will continue to be available

More models: wider range

The M Series uses the same solid polymer ionic membrane in an electric micro dehumidifier to provide maintenance free, low energy dehumidification of enclosure and cabinets.  The new M-10J1R doubles the capacity of the largest cabinet size to 4m³.  Rosahl is widely used for protection against condensation of remote or difficult to access equipment.  It is increasingly used for the protection of electro-optical devices and medical equipment.

For more information, see the new M-Series micro dehumidifier product data sheet

Open the M-Series data sheet here

New micro dehumidifier models

The original MDL Series is designed for enclosures volumes of  0.5m³, 1 and 2 m³. The new M Series extends the range by offering six models for enclosures from 0.25m³ up to 4m³ as follows:



Dehumidifying capacity grams/day


Applicable volume m³

*2 *4

M-2J1R 2 0.25
M-3M1R 2.9 0.35
M-3J1R 4 0.5
M-5J1R 8 1
M-7J1R 16 2
M-10J1R 29 4


*1 Includes pre-formed rubber (ethylene propylene) packer (gasket)

*2 Initial value at 30°C and humidity of 60%

*3 Based on sealed steady state container

*4 See selection information for sizing recommendations


Contact us for prices and delivery


Advantages of Rosahl micro-dehumidifiers


Silent & vibration free

Rosahl dehumidifiers have no moving parts so there is no noise or vibration when operating.


Maintenance Free

Rosahl requires no regular maintenance, reducing total cost of ownership (TCO)

Long Operating Life

Rosahl uses a solid-state ionic membrane giving it a long service life and low operating costs

Low Energy Footprint

Rosahl membranes operate at 3V d.c. and use a very low average operating current to save energy


Ultra Compact

75% smaller than an AA battery, Rosahl can be used in enclosures from 250ml

Operates Below Freezing

Tested to -20°C, Rosahl may be used for internal and external applications

No moving parts

Rosahl dehumidifiers have no moving parts so there is no noise or vibration when operating and nothing to wear our or service

Solid-state membrane

Solid-state polymer electrolyte (SPE) provides reliable operation with low average power consumption and a long service life

No liquid water

The process works at a molecular level and no liquid water is involved, so no cleaning or drainage are needed