This should do the trick for you:
Otherwise, you could restrict the nodes OUT of the normal alerts; and then create unique alerts for that specific node that ignore the daily maintenance window. Depending on the number of devices in question, this may be easiest-accomplished by adding a custom property to your nodes and then using that as your filter in alerting.
Let me know if that helps
Loop1 Systems: SolarWinds Training and Professional Services
Thank you I think this is pointing us in the right direction.