40 Decibels is quieter. 40 decibels is 1 sone which is fairly quiet. A mid-priced bath exhaust fan could be apx. that.
That being said, either 40 or 50 is OK for use when you are not directly in the same room.
On 8/18/2013 3:13 PM, WayneT wrote:
Which is quieter 40dBA or 50dBA?
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