9GV Type Guide Vane Fans Sanyo Denki 9GV-Type Guide Vane Fans utilize Guide Vane technology, which achieves industry-leading performance with high airflow and back pressure while reducing power. These axial or tubeaxial fans are available with a 12VDC, 24VDC, or 48VDC operating supply voltage. The 9GV-type fans feature a 13.1CFM to 1112CFM airflow range, a 3000RPM to 24,000RPM speed range, a 43dBA to 81dBA noise range, and a 2.52W to 600W power rating range. The models with a PWM control function also have a motor protection system that includes a current blocking function and reverse polarity protection.