Invacare IRC5LXO2 Operator's Manual page 6

SAFETY SUMMARY
WARNING (CONTINUED)
DO NOT use parts, accessories or adapters other than those
authorized by Invacare.
DO NOT connect the concentrator in parallel or series with
other oxygen concentrators or oxygen therapy devices.
Use of some administration accessories or certain humidifiers
not specified for use with oxygen concentrator may impair the
performance.
In certain circumstances oxygen therapy can be hazardous.
Invacare recommends that you seek medical advice before using
this machine.
This equipment is to be used as an oxygen supplement and is not
considered life supporting or life sustaining.
Avoid creation of any spark near medical oxygen
equipment. This includes sparks from static electricity created
by any type of friction.
POLARIZED PLUG INSTRUCTION
As a safety feature, this appliance has a polarized plug (one blade
is wider than the other). This plug will fit in a polarized outlet
only one way. If the plug does not fit fully in the outlet, reverse
the plug. If it still does not fit, contact a qualified electrician. DO
NOT ATTEMPT TO DEFEAT THIS SAFETY FEATURE.
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PART ONE