Bob I know a shrouded fan is a lot more efficient and I am afraid that if
you stop the shroud just short of the fan blades you will create a lot of
turbulence and defeat your purpose.....Why not make the shroud with a slip
sleeve that you can adjust to enclose the blades when operating and then
slide forward when you need to change or adjust the belt. You probably only
need a few inches of travel....Make a design with drawings and visit a good
HVAC place with a talented "Tin Man" and have him put something together for
you.
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