Controlled air humidification prevents the aging and damage of books. Because books consist for the most part of paper, glue and printing ink. Depending on the temperature, paper removes moisture from the ambient air or releases it back to it. As it does so, paper expands or contracts again.

If the air is too dry, paper will become brittle and cracked – if the air is too humid it will become wavy and “spongy”. For optimal preservation of books and other documents, a relative humidity of 60-65% RH has been proven. The humidity in this fairly narrow corridor should be kept as constant as possible, regulated humidification is essential.


In libraries, without professional moistening, due to the hygroscopic nature of the amount of paper, the humidity would quickly drop. This has a direct effect on the well-being and health of visitors and employees: if the air is too dry, the human being releases moisture from the water into the environment. The result is a dehydration of the skin, lips and eyes, which has a quick and immediate effect on human well-being . The function of the mucous membranes in the airways decreases and the body is less protected against bacteria and viruses.


A professional humidification in libraries and antique shops brings the following advantages:

  • Protection of valuable and irreplaceable books and documents
  • Create a healthy and inspiring feel-good atmosphere
  • Less cleaning effort due to lower dust load
  • Protection against electrostatic charge
  • High energy efficiency in the air conditioning of the premises