Welcome aboard! First of all you can quickly put your concerns to rest! As long as your refrigerator is running properly then you need no auxillary fan to circulate air, nor be concerned about adding humidity. The properties of the UMAi Dry bag takes care of those issues. Often time people arrive here after reading scads of “how to” reports and watching videos. Oftentimes they all contradict each other so it’s no wonder confusion abounds! That’s the beauty of UMAi Bags!
Before you get started would consider following me? Do not trim your first bag! You may be lucky and get a perfect seal on your first attempt, but if not, trim off the failed seal and start another seal! I must have sealed my first one 6 or 7 times before I got the hang of it! You would be surprised how many guys needlessly go through all of their bags the first time thinking first attempt sealing failed so rip that bag off and start a new one. That is so crazy! Ron