TJERNLUNDAS2 AireShare Room to Room Transfer Fan with Multiple Speeds,130 CFM

What is its noise level when operating, in dB? I want to keep an adjacent walk-in closet ventilated

Can this unit also pull air from below the fan in the bay? (i have a buried hvac register in the same bay that may provide more heat/ac)

minimum distance between the studs for vertical and horizantal application, grill dimensions?

In terms of placement, what if i want to transfer heat in the winter and ac in the summer? more or less centered in the wall vs high-low?