Just been doing some experiments and when I shut the bedroom door nothing happens straight away but after a minute or so the negative pressure must build up and the fan gets noisy, when I open the door again everything calms back down again.
Tbh After another inspection I think it might be the bearings in the fan that are noisy or maybe it’s not well balanced or something.
It’s looking like this is a combination of things, looking at a either a 6” or 10” ac infinity to replace it with, thinking maybe the 6” might be a good option, the 10” ducting goes down to 4” before leaving the loft anyway so can only get so much air through that gap as it is. Also the carbon filter I’m running is 5”
I always used to run a 5” in my tent running hps so a 6” should be fine with led I would have thought, how much heat do two ISH Xbars and two Vbars create? Can’t be more than a 600w hps and 400w of t5