OK plugin, a couple of errors though.

Your fan2 was checking:
.1.3.6.1.4.1.4526.18.4.1.2.2
and should be checking:
.1.3.6.1.4.1.4526.18.4.1.2.3

Your freespace is checking (total space):
.1.3.6.1.4.1.4526.18.7.1.5.1
and should be checking (free space):
.1.3.6.1.4.1.4526.18.7.1.6.1