The following installation manuals are available for the ABH/ABX range:
ABX Ambient - Installation Manual - May 2018 - https://www.reznor.co.uk/wp-content/uploads/2023/12/Reznor-ABX-Installation-Manual-Ambient-EN-2018-05-D301092.pdf
Airbloc ABH Ambient - Installation Manual - March 2012 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AirBloc-ABH-Installation-Manual-Ambient-EN-2012-03-GB-AIR-065-0312-1.pdf
Airbloc ABX Ambient - Installation Manual - February 2014 - https://www.reznor.co.uk/wp-content/uploads/2023/12/AirBloc-ABX-Installation-Manual-Ambient-EN-2014-02-GB-AIR-065-0214.pdf