I have built a DSBB with the 2, 45 degree entrance facing down and I cut the inside 45 level with the top of DSBB. I like it. So no one misunderstands, there is only one PVC entrance.I think this will also help in robbing on weak hives I am going to open one of the normal entrance gates and plug it with #8 scrape wire. I "Believe" this will help the robbing problem as robbers will go to the smell, I hope When the hive builds up I can plug the 45 and open the entrance gate, or just set the hive on another DSBB. I make a feeder with a 1/2" pvc entrance is in the back side of hive, the boardman feeder is on the back outside of the hive Late in September I removed the feeder and was going to plug the hole for winter and the feeder was full of drones. The plugged 45 entrance may also serve as a drone repository if left on into the fall.