How are they inflated?
The basket is laid on its side and attached to the envelope which is then spread out on the ground. A portable (gasoline powered) fan pushes air into the envelope. When the envelope is almost filled with cold air, the propane burner is ignited and the air inside is heated enough for the balloon to rise to an upright position. With a small amount of additional heat the balloon will become buoyant. The inflation usually takes about 15 to 20 minutes.
