The saga continues: Got the 5hp Baldor 184t frame motor home today after it was rebuilt with new bearings, winding insulation and what they called reconditioned and, come to think of it the guys at the shop commented on the 12" impeller and wondered why such a large framed motor was driving such a small impeller. I think there are a lot of guys in this predicament but I kept the conversation above board. I will have it mounted very close to an external wall tomorrow and there will be about 18" from the rectangular outlet of the blower housing to the cinder block external wall.
So, I have a 7"x5.6" blower outlet that will be pointing up, paralell to the wall. I want to make a fitting that will allow this to vent to the outside, through the cinder block which requires a change in direction at some defined angle, between 90 degrees and 180 degrees . There are rectangular to round transitions and it can go out in the round via a long radius 8" PVC pipe fitting, it can go out via a rectangular plenum of some form. I imagine there are other ways do do this but I have no basis in fact to make this decision. My Nagyszalanczy Woodshop Dust Control Gospel has no suggestions.
What is the best way to get the exhaust outdoors? It is so close but then again, so far. Rectangular plenum's are pretty easy to make with plywood on the band saw. Transitions are weird science but can be purchased. I have come this far and I am not in the mood for any compromise in dimensions or shape. Rare earth metals and exotic polymers are not in the offing, but anything sheet metal or plywood is, without question, an option.