The standard round nozzle powers through debris at 409 CFM of air volume at 145 MPH. Flat concentrator nozzle to increase air speed to 189 MPH to power through stubborn debris. 1” Round concentrator nozzle for blowing out crevices and concrete anchor holes. Contractor-grade performance without the hassle of gas. Designed to withstand heavy-duty professional usage with long motor life. Work with confidence, backed by DEWALT’s professional quality and warranty.