High power: high air volume, large wind pressure, speed 2800/minWaterproof and fireproof, pure copper wire motor,ABS environmentally friendly materials250W, caliber 60mm, suitable for arches of about 4 meters; 370W, caliber 65MM, suitable for arches of about 12 meters, 550W, caliber 75MM for arches of about 18 meters, 750W, caliber 85MM, suitable for arches of about 20 metersSupply: wedding arches, bouncy castles, bouncy castles, inflatable pools, boats, etc.Brand new and high quality powerfulApplication - for outdoor bounce houses, water slides, obstacle courses, jumpersGreat for other construction applications as well such as drying wet carpet, blowing off sidewalks, or cleaning up leaves in the yardWarning: Please keep away from children. Never leave appliance unattended when it is connected to the power outlet.