I arrived at my pedi homecare case and noticed the kiddo was on 3L rather than the usual 1L. I asked the family why and they said they turned it up so that they may use the humidification because his nose was so dry. So I educated them on the reason's why the O2 shouldn't be higher than needed (he does have an order for 1-5L) and to use water soluble lubricant to help with the dryness.OK, I've looked everywhere I could think, but can't find any mention of it. I know that for an oxygen flow of 3LPM or greater humidification should be used. But can/should you use it if the flow is 1-2 LPM? And if not, why? BTW he's using a NC if that matters.Thanks in advance.