Recent Global Posts Feed Plugin

I was wondering if it was possible to have one particular site NOT appear in the main feed? I am using a "central" sub site as the main instead of the main itself and am routing all posts from the network into that but than it occured to me after making the first test post that since it also now appears on another site within the network, it will be doubling up in the feed! Is it possible to prevent individual blogs from appearing in the global feed?