your Mining Rig looks very neat dude, usually, a frame like that when placed on the floor using a carpet or your floor looks from wood. by the way, I see the distance between each card is too close together, is there a problem with the temperature on each card.
Like I said. No there isn’t any problem with temp. There are 6 fans surrounding the cards that pull air across them.
I set the software to keep the cards at 65C, and each card modulates it’s fan to maintain that with fan speeds varying from 25-70% fan speed depending on the ambient temp