DeVilbiss oxygen concentrators have noise levels ranging from less than 37 decibels with the iGO2 to 69 decibels with the Compact 1025 10-liter. For comparison, 30 decibels is about equal to a whisper, 40 decibels is about the sound level of a refrigerator, and 70 decibels is about the sound level of a vacuum cleaner or traffic.