Originally Posted by OatStraw
Looks like I will be murdering an old PC tonight. Need the fans and a jumper now
You don't NEED the jumper as long as you factor the differential into your setpoint. I'd call or email Johnson Controls (with your address) saying it wasn't in the unit when purchased.
The fan isn't a NEED either but a nice reassurance that the air temperature is pretty well mixed. This is a fun project with parts that many people can get for free.
I've cut my knuckles more than once by not unplugging the fan before digging around in the chest freezer. The blades spin really fast and are pretty sharp and/or have plastic burs that slice.