Yup! I'm now realizing that this may be circuitry that goes down through all five units being fed from this end. I've looked more closely at Marley's Brochure, and instead of being a screen in the front it's actually a slanted (out at the top end) array of baffles where the water cascades down exposing tons of surface area for maximum heat transfer. While I'm not modeling the insides, I can slant the screening assembly to replicate this feature on both sides. I'm going to stack several layers of the black tulle to make it almost opaque with lots of texture simulating these arrays. I've also sketched a fan on Illustrator in preparation for building one. The blades are adjustable so they're held to the hub by single pivot rods which actually makes building the model easier in some respects. I noticed too that Marley uses a 90 degree gear box to drive the horizontal motor to the vertical fan. I'm going to stay with the belt drive since I've seen them also and I've already made those neat pulleys.
I see too that there's a flanged rim at the top edge of the venturi. I'm can add something there which will also stabilize the shape.
