Originally Posted by labman
OK, there is a slow flushing stool, tank type with a flapper. When you flush it, a burst of air comes first and then the water slowly drains. It is the style that has the hole to start action, and it is clear. The one right next to it is OK. There is one vent for 2 rest rooms, a water fountain, and a former restroom on the floor above with everything now blocked off. 50's masonry construction. If the vent is blocked between to 2 stools, how would I ever get to it? The vent isn't even over the wall the restrooms back up to.