From inside (document excerpt):
Infinity ICS Model 58MVC, Direct Vent 4 Way Multipoise Condensing Gas Furnace With IdealComfortt IdealHumidityt Service and Maintenance Procedures NOTE: Read the entire instruction manual before starting the installation. ! WARNING ama ISO 9001:2000 CERTIFIED ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow warnings could result in personal injury, death, or property damage. Improper servicing could result in dangerous operation, serious injury, death, or property damage.
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-Before servicing, disconnect all electrical power to furnace. -When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly. -Verify proper operation after servicing. REGISTERED As an ENERGY STARĀ® Partner, Carrier Corporation has determined that this product meets the ENERGY STARĀ® guidelines for energy efficiency. SAFETY CONSIDERATIONS Recognize safety information. This is the safety-alert symbol. When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation. Untrained personnel can perform basic maintenance functions described in User’s Information Manual such as cleaning and replacing air filters. All other operations must be performed by trained service personnel. When working on heating equipment, observe precautions in the literature, on tags, and on labels attached to or shipped with the unit and other safety precautions that may apply. ! WARNING ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in property damage, personal injury, or death. The ability to properly perform maintenance on this equipment requires certain expertise, mechanical skills, tools, and equipment. If you do not possess these, do not attempt to perform any maintenance on this equipment other than those procedures recommended in the User’s Manual. ! WARNING ! CUT HAZARD CAUTION FIRE OR EXPLOSION HAZARD Failure to follow this warning could result in personal injury, death, or property damage. Never store anything on, near, or in contact with the furnace, such as: 1. Spray or aerosol cans, rags, brooms, dust mops, vacuum cleaners, or other cleaning tools.