The outlets work inversely of each other. One will trigger on humidity rising and one will trigger upon humidity falling. The set points are fully adjustable as well as the hysteresis between the low and high setting.
You could probably get away with 2 inch depending on how long you veg. Three inch is the shizzy. Never had one clog even with 6 footers. Also it really helps to put a valve on the pickup side of your circulation pump. Makes changing or servicing much easier. The P.A. hydro systems doesn't do...
Might have to go on this! I see one of my Spider Farmer SF4000"s are only half lit. Looks like a driver failed. Will order a replacement driver but they are close to 5 years old now. I Like these bar style lights better anyway.
https://www.arbico-organics.com/product/mite-predator-phytoseiulus-persimilis-spidermite-killer-greenhouse/mite-predators
These will decimate mites. They only ship overnight.
https://shop.pahydroponics.com/5-pack-with-lids-8-gallon-ez-stor-container-buckets-w-lid/
Check these out. Also have 3 inch bulkheads for a good price. Never have to worry about root issues...
https://www.toolots.com/tuopuke-mini-rosin-press-8ton-pressure-hydraulic-6x12cm-plates-hp02.html?omnisendContactID=606621bd1971975089f19aa1&utm_campaign=campaign%3A+Deal+of+the+Month%21+%2861f424133dc932001d710ab8%29&utm_medium=email&utm_source=omnisend
8 Ton Mini Rosin Press $269.00