[Matthias Wandel] had something of a wasp problem so he built this trap to catch the pesky fliers. These look like Yellow jackets and they can build some huge nests (check out the picture of a 2-year old dwelling). We’ve experienced a large nest in the walls of an apartment and weren’t as clever at fixing the issue. [Matthias'] solution uses a 1/3 horsepower blower to snatch the wasps out of the air and retain them in the trap above. The trap sits on the blower with some insect netting as a filter, the hose acts as the inlet and is placed at the entrance to their lair. It took nine hours to fill this trap; we wonder where he chose to release them. Enemies of [Mr. Wandel] beware.