the s19j 100th set to low using fan spoofing and large eight inch dual vents with an eight inch duct fan is good.
https://www.ebay.com/itm/1-pc-4-Pins-Fan-Simulator-Emulator-For-A3-D3-L3-S7-S9-S9i-S9j-S15-S17-T17-T17-/203764567923?
https://www.ebay.com/itm/4-6-8-Inch-Exhaust-Inline-Duct-Fan-HVAC-Blower-Kit-w-Variable-Speed-Controller/285066554125?
https://www.ebay.com/itm/Antminer-DR5-L7-S15-T15-S17-T17-S19-Z9-Z11-8-Double-fan-duct-Shroud-eBit-10-2/304119146264?
it is effective on power and not crazy loud.
To me the best is the L3+
use a 1000 watt corsair
set to about 600 watts
fans to 20-30%
there is a decent 150cfm delta fan you can use.
https://www.ebay.com/itm/5-Delta-fans-120mm-4000-RPM-12-Volts-4pin-Connector-New-And-Working-/185296944683?
there is an issue with the l3+ some times the hashboard can catch the fan a break a blade.
best fix is buy longer screws for the fan and washers.
put a set of 4 washers under the plate and that moves the mount plate away from the hash boards.
then put a set of four washers between the fan and the mount plate.
https://www.amazon.com/dp/B074V14N8Y?
the fan screws are a little bit longer.
https://www.amazon.com/dp/B06ZYRLGHN?
you can use the 4mm and the 5 mm on the fan mount
and the 3mm between the mount plate and the main frame.
these also help with rattles.
these l3+ have been great gear for me space heater deluxe and money maker.