The following installation manuals are available for the Cobra range:
Ambirad CB Cobra 12-20 - Installation Manual - April 2004 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-CB-Cobra-12-20-Installation-Manual-EN-2004-04-GB-COB-112-0404.pdf
Ambirad CB Cobra 40 - Installation Manual - February 2005 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AmbiRad-CB-Cobra-40-Installation-Manual-EN-2005-02-GB-COB40-119-0203.pdf