There should be at least 3 feet of clearance on all sides of the inflatable. This provides the person supervising enough room to observe the participants and provides the unit clearance from snagging while it flexes or is being inflated or deflated. There should also be the adequate height above the unit. You can view the dimensions of the units and the minimum space required for all of our inflatables on the Bouncy Castles & Slides or Interactive Games pages. The setup location should also have a very gradual slope and be free of rocks, limbs, debris, and animal waste.