Panasonic WhisperValue DC fan and TRB transfer box – anyone using these in the field yet?
For a while now I’ve been considering different ideas to distribute the air from my mini split to bedrooms when the doors are closed. I just noticed that Panasonic recently came out with a new DC motor version of their 3 3/8″ deep WhisperValue fan, with selectable speeds (50/80/100CFM) and pretty low sone (noise) ratings.
They also make this transfer box that’s designed to fit this fan (google Panasonic TRB — I can’t link anything or the spam filter gets me).
This creates a setup that fits into an existing 2×4″ framed wall and blows air from one side to the other. I could put it above each bedroom door and it’d pull air from the hallway (which the mini split blows down). Each bedroom already has an obsolete 6×12 register that leads down an abandoned duct to the basement — this could now act as the “return”. It seems like an ideal solution. Better than the Tjernlund AireShare (which is louder and pushes fewer CFM). And better than putting exhaust fans in the hallway ceiling and losing 8″ of headspace. But this is all fairly new stuff and I haven’t seen any first hand accounts of how well it works in practice. So — have any of use used this setup yet? How’s it going?
I have one question in particular: The output of the transfer box is sized for a 4″x10″ register. At 50, 80, or 100CFM, how far would the air noticeably “throw”? Would care need to be taken to direct the air at the ceiling, or away from people, to prevent a drafty feeling in the winter? (Given that it’s blowing nearly room temperature air)
GBA Detail Library
A collection of one thousand construction details organized by climate and house part