In article , wrote:
Craig Toth ctothATsofthomeDOTnet wrote:

Do they make a timer that can be wired to a switch (bath fan) that only
allows the device, once turned on, to stay on for a set time...

Herbach and Rademan (800) 848-8001 http://www.herbach.com sell a nice
$4.95 Navy surplus humidistat, their item number TM89HVC5203, with a
20-80% range, a 3-6% differential, and a 7.5A 125V switch that can be
wired to open or close on humidity rise.

"Size: 5-1/8 x 2-5/8 x 1-1/8"."

Makes it kinda hard to mount in a standard single-gang fixture box.