2. Warning and SafetyInstallation and maintenance should only be performed by qualified and authorized personnel.Wear appropriate safety gloves, eye protection and dust cap. Use proper tooling for mounting and demounting cover plates. Use a proper cleaning blade (maintenance tool), see spare parts in Annex 1.Do not use the cleaning blade for other purposes than maintenance and cleaning of aluminumheat exchangers. Do not use the blade when it is buckled or broken.Clean the blade after use thoroughly with water, and dry it properly.General instruction for maintenance: Switch off the power. Turn off the gas supply. Read the installation and maintenance manual. And read all appropriate warnings. Wait until heat exchanger is cooled down sufficiently, before starting removal of covers.General remarks: In this report the decimal point will be used as separator. For instance 6.2