wellygary:

kiwitrc:

now if only i could get a humidistat instead of the electrical timer to control output!

Here you go http://xpelair.co.nz/afawcs0141432/CATID=18/ID=20/SID=1030025853/productdetails.html

and here http://www.securimax.co.nz/fans/fan_accessories/humidistat_controllers.php you should be able to get these from someone like Mastertrade

Those humidistats turn on when a certain humidity level is reached, ie a steamy bathroom etc,

The OP is seeking a humidistat to turn Off when a certain level is reached,