For what it’s worth…..and this is an unpopular way of doing things, but I haven’t used a fan besides my extraction fan in like 5 years or more. I turn up the extraction and only open the bottom two vents about a third each….it creates enough air movement in the tent to rustle the leaves. I haven’t dealt with any mold or PM issues in that time. And I’ve done it in both dry and humid environments with equal results….
I got sick of dealing with the shitty built fan’s that were nearly impossible to keep in place…