Two of the additional 3 vents at gound level are open.
I am running 20/4 now and lights off between 6am and 10am as thats when I am asleep for sure. :P Want to have free access when I am awake hehe.
I put the plants closer to the floor and lights 10cm further away and got to 30 C (86F) so I think its ok.

Damn these plants really grow like, eh, weed. Its insane to see how they develop even after just a few hours since last check