Last weekend I finally got tired of birds flying down the chimney and into the stove (when it wasn't in use, of course). This happend before, but usually in the Spring. Anyway, I replaced my Metalbestos cap with a 3/4 inch mesh screen Homesaver brand stainless cap. I didn't want to go with a screened cap because of concerns about creosote buildup. As it turns out, it seems like my draft improved because (I'm guessing) the new cap (which is larger and doesn't have a metal band blocking part of the opening) allows more air to flow over the chimney pipe and helps draw air/smoke out. That, or it lets smoke out faster. Or, maybe, it's just my imagination and I just want to believe that I got something extra for $130.