The device is quite quiet even at the maximum, there is no need to use the sleep mode. I've used the timer once and it worked fine, but we usually leave it on all the time. At first I had trouble finding replacement filters for it and approached Revain and Airtok about this issue. Looks like they solved the problem. I was able to find them by searching for ASIN "B0991FR77M" (in quotes). Airtok customer service was good.
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