Question : Problem: Dell SNMP information

I am monitoring Dell servers with a third party app. I am looking for the Dell SNMP thresholds. I can find Dell SNMP OID's but not the threshold.  For instance I know the system board fan OID but I need to know what the values mean

Answer : Problem: Dell SNMP information

It is of type DellSigned32BitRange which is an Integer
http://ipmsupport.solarwinds.com/mibs/MIB-DELL-10892/item.aspx?tid=DellSigned32BitRange

As I'm sure you've already seen it returns either RPMs of the fan or on/off depending on the subtype.
http://ipmsupport.solarwinds.com/mibs/MIB-DELL-10892/item.aspx?id=coolingDeviceReading

so it really depends on what the Dell specs say is appropriate for that particular fan.

have you checked out other attributes in that tree. like the coolingDeviceStatus?
http://ipmsupport.solarwinds.com/mibs/MIB-DELL-10892/item.aspx?id=coolingDeviceStatus