Bouncy Castle
A bouncy castle is an inflatable amusement ride.
Nomenclature
Bouncy castles are also known as a jumping castles, bounce houses, moonbounces, moon walks,
Commercial Bouncy Castles
Centrifugal Blower
The centrifugal blower (also referred to as the Blower, Fan, Pump or Motor_) is an electric or petrol/diesel motor driving a centrifugal fan that delivers continuous, high-pressure (how much?) air to the bouncy castle.
Typically the blower is located at the rear of a bouncy castle (or other inflatable) so that is is - Unslightly - Trip Hazzard - Noisy
Whooshing & "Clicking" Sounds
As patrons jump on the bouncy castle the air pressure inside the structure temporarily increases. As the inflatable is
In addition, some (all?) blower designs have vanes/flaps on the outlet pipe that act as a one-way check valve. As air tries to feed back into the blower, these flaps snap shut, producing an audible "click" sound.