That gaurantee doesn't mean much a good shop vac with a bag and hepa filter will work well.The top half of my stove is a fly ash collector and has nooks and crannies like a pellet stove inside. It would also be nice if I could vacuum out the bottom of my clean out instead of awkwardly shoveling it out. My wife will murder me if dust comes the vac and settles in our house. It's also horrible for your lungs. The Cougar is nice because they guarantee no dust ever gets out. I'll also be getting a wood cook stove and it would be nice to use the vac on it as well.