From inside (document excerpt):
58PHA/PHX Performance Boost 80 4 Way Multipoise Induced Combustion Gas Furnace Input Capacities: 45,000 thru 135,000 Btuh Installation, Start up, Operating and Service and Maintenance Instructions Series 100/A SAFETY CONSIDERATIONS 2 INTRODUCTION 3 CODES AND STANDARDS 4 Safety 4 General Installation . 5 Combustion and Ventilation Air . 5 Duct Systems . 5 Acoustical Lining and Fibrous Glass Duct . 5 Gas Piping and Gas Pipe Pressure Testing .
5 Electrical Connections 5 Venting 5 ELECTROSTATIC DISCHARGE PRECAUTIONS PROCEDURE . 5 LOCATION . 6 INSTALLATION 10 Upflow Installation 10 Downflow Installation . 11 Horizontal Installation . 13 Filter Arrangement 13 Air Ducts . 13 Gas Piping 16 115- Wiring 21 -V START-UP, ADJUSTMENT, AND SAFETY CHECK . 35 General . 35 Start- Procedures . 35 -up Adjustments . 35 Check Safety Controls . 38 NOTE: Read the entire instruction manual before starting the installation. Portions of the text and tables are reprinted from NFPA 54/ANSI Z223.1-2006E, with permission of National Fire Protection Association, Quincy, MA 02269 and American Gas Association, Washington DC 20001. This reprinted material is not the complete and official position of the NFPA or ANSI on the referenced subject, which is represented only by the standard in its entirety.