2.2 Safety Precautions, Safety Measures• It must not be possible to touch the fanwheels with your hand. The unit maytherefore only be operated with the ductsystem connected. The unit cannot beopened without the use of tools.• In conjunction with possible later warrantyclaims and in order to ensure the properfunction of your system, we recommend thatyou conclude a service contract with anapproved specialist company.2.3 Intended UseThe Comfoair 140 is intended for the extraction ofpolluted room air and the supply of warmed orcooled fresh outside air. Use in any other way isconsidered to be contrary to the intended use.The manufacturer declines any responsibility fordamage, injury or other consequences resultingfrom such use.If used in the same building as open fires, therelevant standards and regulations must beobserved by the installing company.