The air to air exchanger was a possible solution to the heat/humidity concern... From what I understand they push air from the room outside... suck air from outside pulling it in... but they 'exchange' the heat from the room air and put it in the outside air...
Many years ago I did use gang valves on small/medium air systems... Every time you add an air powered filter you will likely have to adjust each valve, but the adjustment is quick and easy.
After a lot of research, I did come to accept that a PVC manifold system aroudn the entire room is the way to go. I planned/designed a loop around the room with T's in the loop that branched off with hoses taped into the brances... This in theory supported equal pressure available at each outlet.
For the hobbyist on the cheap (most of us) you can tie a loose knot in the airline and if it is too strong tighten up the knot just a bit. That's a lot cheaper than buying 20 valves.
Many years ago I did use gang valves on small/medium air systems... Every time you add an air powered filter you will likely have to adjust each valve, but the adjustment is quick and easy.
After a lot of research, I did come to accept that a PVC manifold system aroudn the entire room is the way to go. I planned/designed a loop around the room with T's in the loop that branched off with hoses taped into the brances... This in theory supported equal pressure available at each outlet.
For the hobbyist on the cheap (most of us) you can tie a loose knot in the airline and if it is too strong tighten up the knot just a bit. That's a lot cheaper than buying 20 valves.