Humidity control system

[FranklinMorphs]

You are talking about using a humidifier so there isn't any misting, I am not sure why you would need a ball valve per say. if you have a main line going from the humidifier to a "T" with the same length lines going to each tub then in theory the same amount would be fed to each tub. Thoughts?

Distance from humidifier to tub will have to be different. Most likely a hardline T-ed off into each tub, fastened along the back of the rack. A manifold to ensure same length to each tub would be drastically more expensive and the increase in total system volume would require greater total output and would most likely induce more condensation in the lines. A straight vertical pipe will allow most if not all condensation to drain back to the system.

Misting wasn't exactly the issue I was worrying about, just thinking about balance in the system.

Oh, and I'm not liking my selection of hygrometers, 12v is almost impossible to actually get. The WH8040s are what I like to use, but they are 110v, so relay system is not going to work ideally. I hate dual A/C relay systems. I'm going to go with a single WH1422 per tub. It'll do temperature and humidity control in one box. Not as attractive as sytem, and even with almost identical specs, it's not quite as accurate a system, but it'll get the job done. Will require a relay on each of the heating elements, aside from the single relay to control the humidifier, but not a big deal.