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From inside (document excerpt):
58MVB 4 WAY MULTIPOISE VARIABLE CAPACITY CONDENSING GAS FURNACE For sizes 040 120, Series 120 Installation Instruction NOTE: This furnace can be installed as a direct vent (2-pipe) or non-direct vent (1-pipe) condensing gas furnace. Furnaces installed in Canada must use Vent Systems that are certified to the Standard for Type BH Gas Venting Systems, ULC-S636. ULC-S636 certified plastic vent system material or the components of ULC-S636 certified vent systems must not be interchanged with other vent systems or unlisted pipe/fittings.
Vent components supplied with the furnace and components in factory authorized vent kits may be used with ULC-S636 certified vent systems. The ULC-S636 certified plastic components, and specified primers and glues of the certified system must be from a single-system manufacturer and not mixed with other system manufacturer’s vent system parts. The first 3 ft. (.91M) of the venting system must be readily accessible for inspection. Some Provinces may require the combustion air system to be ULC-S636 certified. AIRFLOW UPFLOW HORIZONTAL LEFT DOWNFLOW AIRFLOW HORIZONTAL RIGHT AIRFLOW AIRFLOW A93041 Fig. 1 – Multipoise Orientations TABLE OF CONTENTS PAGE ama ISO 9001:2000 CERTIFIED IMPORTANT . 2 SAFETY CONSIDERATIONS 3 CODES AND STANDARDS . 6 INTRODUCTION 7 REGISTERED APPLICATIONS . 7 LOCATION 15 INSTALLATION 20 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. START UP ADJUSTMENTS AND SAFETY CHECK. 43 , 1 Required Notice for Massachusetts Installations IMPORTANT The Commonwealth of Massachusetts requires compliance with regulation 248 CMR as follows: 5.08: Modifications to NFPA-54, Chapter 10 2) Revise 10.8.3 by adding the following additional requirements: a. For all side wall horizontally vented gas fueled equipment installed in every dwelling, building or structure used in whole or in part for residential purposes, including those owned or operated by the Commonwealth and where the side wall exhaust vent termination is less than seven (7) feet above finished grade in the area of the venting, including but not limited to decks and porches, the following requirements shall be satisfied: 1. INSTALLATION OF CARBON MONOXIDE DETECTORS. At the time of installation of the side wall horizontal vented gas fueled equipment, the installing plumber or gasfitter shall observe that a hard wired carbon monoxide detector with an alarm and battery back- is installed on the floor level where the gas equipment is to be installed. In addition, the installing -up plumber or gasfitter shall observe that a battery operated or hard wired carbon monoxide detector with an alarm is installed on each additional level of the dwelling, building or structure served by the side wall horizontal vented gas fueled equipment.