Alaska Direct Vent idea

If you look back at my posting history you will see that I have had issues with fine coal ash getting into my direct vent bearings and making them extremely loud. I have gone through 2 motors because of this. I tried refurbishing the one and it held up for about a month and today let loose with a loud wail. SO I have broke down and installed a new one I got last season. Below is a pic of it. Look at the bolted on A shaped piece of steel surrounding the lower fins. My idea will attach to that and extend approx, 1 inch out past the black fan blade and go the entire way down to the hearth pad. The second picture shows it bent but not attached yet. Any thoughts?

Lots of views but no responses? Anyone...all thoughts are welcome.