(efficiency 10 to 40kg/h*)

Maximally efficient, adsorption dehumidifiers BDHM…B connect high efficiency, solid design and possibility to fully modify the device to suit your own needs. 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.

BDHM…B dehumidifiers by LEWACO were designed to achieve the lowest possible humidity of the dry air. They are dedicated to applications in which it is required to achieve the lowest dew point behind the dehumidifier.

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: 18– 98 kg/h* 
Dry air efficiency: 2500 – 14000 m3/h 

  • ..B dehumidifiers were design for process dehumidifying, where low dew point is a priority Dehumidifier has a body made of aluminium profiles and panels insulated with 50 mm mineral wool, and made of stainless or galvanised coated sheet 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
  • ..B 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
  • High quality materials 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 180B18,0250070027,023009001600
BDHM 215B21.5300090038.1271011201680
BDHM 265B26.54000130051.3271011201680
BDHM 310B31.04500150055.3271014201980
BDHM 460B46.07000220090.2271014201980
BDHM 560B56.075002500109.0291014201980
BDHM 680B68.0100003300123.0291014201980
BDHM 820B82.0110004000149.5321017002260
BDHM 980B98.0140004600177.0321017002260


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

*for density 1.2 kg/m3

Principle of operation of dehumidifier BDHM..B

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…B dehumidifiers have no rotor heat recovery and therefore have more efficient dehumidification process efficiency and possibility to achieve lower dew points.



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.