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Gary,
We've been using a CPAP machine for well over ten years. Our inverter is NOT a pure sine wave model. We've had zero problems using it. We also have used our computer powered by the same inverter. Again no problems. So I have to agree with Carl that you don't "need" to have a pure sine wave inverter. But to be on the safe side (and you don't mind spending a bit more for it) a pure sine wave inverter would be nice. Good luck and hope to see you on the road some day. Dennis
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