I would suggest using the large squirrel cage blower attached to appropriately large diameter ductwork and route that to the four torch stations with reduced ducting to equalize the distribution of the vacuum draw.
Each torch station would have hoods slopping to the duct work connections just like commercial buildings have distribution ducting.
It might be worth your time and money to pay for an hours conversation at a local heating and air conditioning contractor.
They will have the equations and the cubic feet per minute details in their heads and will save a lot of time and effort of hunting the numbers and equations up your self.
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The Zombie Apocalypse is Upon Us.
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