Sounds like Shotgun Mold. My wife's car gets covered with it due to where she has to park for work.
http://plantclinic.cornell.edu/factsheets/artilleryfungus.pdf
The reason the Protovest works is because the fan for the 30Hp single motor is engineered for that application. Your blowers fan and nozzle design is engineered to make it effective. I think you just need to add one more blower in the middle and move the other 2 farther apart enough to get the...
Your not going to have enough volume of air to make the side nozzles effective. I would suspect that adding anything to your existing producers would result in a less acceptable result than what you get now.
I'm assuming the flag consists of one or two magnets that pass by a hard mounted prox switch? Fashion a bracket for the flag that can be attached to the shaft with a hose clamp.
Use the search function and read all the existing threads about this topic. Then get back to the members here and maybe someone will help you avoid blowing a lot of money.
My experience with industrial items made in China; substandard steel, inferior machining, badly spec'd components, lack of availability of spare parts etc....
The plastic one I linked to, can be disassembled and you can insert a stronger spring to make it work for your installation. Mine is installed right before the application arch.
Not always. A spring loaded diaphragm check valve would work great for this application. It's what I use to solve the same problem. Make sure it has enough size to ensure that you can get enough volume through the valve.
Check valve
Ohio's minimum wage just went to $7.85 on Jan. 1. The voters decided a few years ago to make it rise every year based on cost of living index. I used to give merit raises to my line workers but since this was enacted I stopped.