Hi I built a bee vac and finely got to use it. I swear that vac is the best thing since the hive tool. I will take it to any swarm capture in the future. I had a small swarm the size of a cantalode and had them in the vac in less than five minutes. When I removed the inner box there were no dead bees. To create the vacume I used a 1 1/2 gal shop vac from walmart.To close the hole for the vac hose I used a mouse trap ans a piece of hardware cloth. I would recomend anyone who captures swarms to build, buy , borrow or steal one of these Thanks Dan