Negative tent pressure

Depends on your setup bud. A simple piece of cardboard leaned over the port can prevent a light leak. You could also look at ways to lower the RH in the room you are pulling air from to combat that issue. There are certainly many ways to tackle your issue. The negative pressure kits or diy on those would be the easiest if you have your stuff dialed in and you don’t want to mess with your environment.

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