The Happy Birthday Modular is for ages 12 and younger and holds 10-12 children at a time. Unit measures 15’x15’x15′. With the set up of every inflatable we ask for 3ft of extra space around the outside, so for this item we would need a 18’x18’x18′ area for set up. This unit is what we call a “modular”. This means that we can add a banner to it to make it the theme of your party. This unit does have a 15×15 COVERED bounce area.