Suuuuuuuup.

This is my first post here (I lurk a lot on forums, please accept my mushroom beebs as tribute). I'm working on possibly getting a HART Ultimix system installed via grant funding, however I'm wondering how much of a difference there is between the $100 brass solenoids and the $17 ones? I can venture to guess quality, but can anyone describe what the weak points of a solenoid are? I have limited experience installing solenoids.

Butforealtho - I don't want to clean my hydrofoggers anymore lol

I'm about to watch the coroplast HRV podcast for the 5th time cause I'm trying to cook up a way to integrate them into my warehouse build. I mostly understand it, however I get a little confused with how the air is being pulled in from the bottom as well as being exhausted out the bottom. Is that bottom 'spore dump' zone walled off below the vent to keep the air systems separate?