So start calculating the amount of air you need to be moving, if you want to use 250cfm per S9 as suggested that would be 7250cfm min, but you also mentioned S17s and i don't really know about those, maybe those need 500CFM each?
So to move that air you need some powerful fans, and they can take part of your energy, so leave that margin. Of course you need enough holes or ventilation to be able to move that mass of air, in and out of the place.
Whatever your electric capacity is, don't go above 80%.
Oh and by the way, those 4 fans you mention, are equivalent to 9888 cfm, those should do in theory, not accounting for the S17s. You can use this
online calculator.
Actually wherever your air intake is, you CAN use filters, and replace/wash them periodically (buy twice as many). You can go from finding your favorite fabric to the actual filters used in large central air conditioners. The filters slowdown air intake so you might need even larger aperture. It is nice if you can get a measuring tool for cfm, to verify the fans are actually moving the correct amount.
But of course, you can also find out the hard way, by looking at them overheat etc.
If you don't filter the air you'll have to schedule shutdown for maintenance cleaning. All that air moving pulls lots of dust, its like giant vacuum cleaner, you'll see... (and at the other side you'll have a giant air dryer, quite useful too).