The following installation manuals are available for the FSO range:
FSG-FSO - Vertical To Horizontal Conversion Instructions - September 2000 - https://www.reznor.co.uk/wp-content/uploads/2023/12/Reznor-FSG-FSO-Vertical-To-Horizontal-Conversion-Instructions-EN-2000-09-0009KTFS001-EN.pdf