Some of the links on this forum allow SMF, at no cost to you, to earn a small commission when you click through and make a purchase. Let me know if you have any questions about this.
Always thru the vent. On my MES 30 Gen 1 it's the top vent. It's never a good idea to close a door on wires. The probe wires can be prone to failure on their own as it is without helping them along.