I'll get a model number for you soon, but they are 80x80x25mm so you have to mod the carriers for some cases (the ones with the plastic thumb notch need that removed.) The Panaflo 3-pin connector is a couple of mm to taller than a 4-pin connector so it won't fit in the carrier properly for hotswap, so I let the fan tails hang free and connect them to the mobo or backplane directly (or with splitters.) When I put Noctua NF-A8-PWM fans in the carriers, you can slice off one of the connector keys and it will work hotswap. Depending on the ambient temperatures you have though, the 0.17A Panaflos I am using might not move enough air through the JBOD. Unless your ambient temps are quite high though, I think it is safe to run the SC847 JBODs on only 4 of 7 fans, and of the 0.6A variety - that cuts noise a lot.
For an older SC836 though, the PSU fans are the worst offenders, get any 80+ gold or platinum replacement PSU as a first step, but if you have the 1.4A, 1.1A or 0.8A stock Supermicro fans, try to get some of the 0.6A ones as well.
I wish Noctua made an 80mm fan in their IPPC line - something that moves roughly 2-3x the air of a NF-A8-PWM. The lower power Supermicro 0.6A fans are not bad at all with a PWM motherboard to spin them way down, but at the speed these JBODs run them at, they are a bit too noisy.
