My powered exhaust vent is on the same side as the dehumidifier, the non powered louvers are on the opposite side and it works just fine.
The box which houses the fan sits inside of the kiln chamber with the louvers to the inside as the fan will suck air through the louvers and push it past the fan and out of your chamber. Mine is flush mounted to the stainless steel chamber wall. It does not look right, but it is.
I went through the same exercise you are presently going through before understanding how to set it up correctly.
Also - Be sure to check the voltage set up in the fan motors, my taps were all tied in for 120V.