Thanks everyone. Yes, I should have exercised more patience for your replies. (new to the forum) Guess I will do what should be a pretty simple "experiment." Put one grill on and have one off, and just listen!!
My primary concern is dust, dirt and mostly cobwebs. I live alone and don't do a real good job up in the corners of my room. A gal came over last weekend and was "kind" enough to point out a huge cobweb up by the ceiling. (made me feel real good!!!!!!!!!)
I have to believe these would develop in the cones etc, so I would then be faced with either just wiping the cones off or even using a vacuum cleaner attachment. (eg the one with the brush on the end?)
Hmmmm. Well, you all can tell by now that I am somewhat of a "worry wart."
Once again, thanks for taking time to offer feedback.
Take care,
Joe