I did a Google search - why didn't you? The first two results are the installation manual and the user manual.
Installation manual:
http://cdn0.vokera.co.uk/wp-content/uploads/2009/04/linea_installation_and_servicing_instructions.pdf - see section 5.3 and look at the drawings as well.
User manual:
http://cdn0.vokera.co.uk/wp-content/uploads/2009/04/linea_users_instructions.pdf
Some people!, January 2015