(efficiency 4.6 to 96 kg/h*)

BDHM…R adsorption dehumidifiers were designed to recover heat internally with the nominal dehumidification efficiency, and at the same time limit power consumption. Similar to all adsorption dehumidifiers, they are built basing on an adsorption rotor made of carbon soaked in silica gel. Thanks to this, maximal dehumidification effect can be achieved.

Models with efficiency up to 10 kg/h* are made of stainless steel. Bigger devices have bodies made of aluminium and insulated panels

Additional advantage of devices from this series is the option to adjust the device to recommendations and requirements of the customer by creating special versions (it is possible to equip the dehumidifier with new elements and modify parameters, i.e. amount of dry air, fan compressions etc.) Thanks to this, the dehumidifier extends its functions with additional filtration or regulation of air temperature.

Dehumidifiers have PZH certificates which allow to use them in food and pharmaceutical industries.



Dehumidifying capacity: 4.6– 95 kg/h* 
Dry air efficiency: 1000 – 14000 m3/h 

  • ..R dehumidifiers were designed for process dehumidification, they have bodies made of aluminium profiles and panels insulated with 50 mm mineral wool, and made of galvanised steel. It is possible to have panels made of stainless steel.
  • the regeneration heater is electric by default, it is possible to use gas, vapor or water heater. To measure regeneration temperature, electronic temperature regulation is used
  • ..R dehumidifiers allow to create them in a version optimal considering the requirements thanks to sectional structure Besides dehumidifying function, they can be equipped with initial and finish coolers, process heaters, heat recovery or additional filtration Everything is in one unit.
  • High quality and reliable components of known manufacturers were used for construction
  • uniquely efficient adsorption rotor with long life cycle
  • disposition pressure of process and regeneration fan chosen individually
  • dehumidifiers can work in the full humidity range (0-100%RH) and below zero temperatures (-25C to +40C)
Technical data:


Dry air**

[m 3 /h]

Humid air

[m 3 /h]

Power consumption


Dimensions [mm]
BDHM 46R4.610002506.46804501100
BDHM 50R5.29003507.86805501200
BDHM 75R7.51200450126608101370
BDHM 80L7.3125043010.58456201080
BDHM 90L10.0150058014.78456201080
BDHM 100R10.0150060015.515609101370
BDHM 125R12.5200050019176010301390
BDHM 150R15.0260090024176010301390
BDHM 200R20.03500130032195012501590
BDHM 240R24.04300150040205013501790
BDHM 300R30.05000190048215013501790
BDHM 380R38.06500230048230014801900
BDHM 420R42.07500250064250016501950
BDHM 540R54.09000300080280016501950
BDHM 660R66.0110004200110340016501950
BDHM 950R95.0140004700127350016502300

*for process air conditions t=+20⁰C, 60%RH

*for density 1.2 kg/m3

Principle of operation of dehumidifier BDHM..R

The core of the adsorption dehumidifier is a silica gel drying rotor. Dehumidifying is done in the process part, where microscopic water particles are adsorbed at the rotor surface. Dry air is let to the process by the process air. Regeneration air is used to regenerate the rotor, which vaporizes water from the rotor after appropriate heating. The humid air is removed out. BDHM…A dehumidifiers make use of rotor heat recovery to heat the initial regeneration air. This solution allows to save energy used to regeneration process.

  • mechanical humidity sensor to control the device
  • electronic humidity regulator to control the device
  • possibility to use additional filters, heater or air cooler
  • possibility to communicate with the device by Modbus protocol


Adsorption dehumidification technology is the most efficient dehumidification method. It is characterized by high efficiency and durability. Adsorption, washable drying rotor is the most element of the device. It can work 10-12 years, depending on operation conditions. Humidity that is removed from the air is adsorbed at the rotor surface and it does not interfere with its structure, so the rotor maintains its drying features for a long time.

Adsorption dehumidifiers are distinguished from other solutions by the possibility to work within the full range of humidity (0 to 100% RH) and very wide temperature range, including temperatures below zero (-25C to +40C). Using adsorption dehumidifiers by LEWACO gives the option to achieve very low dew points (e.g. DP=-20C, DP=-25C for special versions).

Another advantage of adsorption dehumidifiers that is a result of their amazing durability is the possibility to achieve the effect of appropriate dehumidification with minimized amount of air necessary for this process. As a result, ventilation ducts and sizes are smaller.

Adsorption dehumidification basing on LEWACO devices can be used in all weather conditions, with all humidity levels, and guarantee efficient solution of the problem of humidity for long years.