for the skies to darken, for thunder to rumble, for the ground to shake or for the four horsemen of the apocalypse to ride forth across the land. Having said that, it must be the end times. Look across the ocean at a small and increasingly irrelevant country that just voted to abandon the European Union. The people there have already surrendered to the end times. It's like watching the Branch Davidians from Waco, Texas all over again!
The trick was to replicate some of my plastic plank cut offs. I used some (since those planks were horrendously expensive I'd saved my off cuts). I used my adjustable hole saw to cut a 5 inch hole then screwed down the fan and battery pack. After that, I soldered the wires in reverse so the fan will suck air from under the body and blow it into the cabin. Finally, I sealed things nicely with latex sealant and glued mosquito mesh on the underside.
I had a look at the engine filter that will be used under the bus to filter the dust and junk that will be blowing about, out. The filter mount will be straightforward. That construction was curtailed however by the weather.