Oil-free PM VSD screw blowers of the BS series include the following models: DHH-11-BS, DHH-15-BS, DHH-22-BS, DHH-30-BS, DHH-18.5-BS, DHH-37-BS, DHH-45-BS, DHH-55-BS, DHH-75-BS, DHH-90-BS, DHH-110-BS, DHH-132-BS, DHH-160-BS, DHH-185-BS, DHH-200-BS, DHH-220-BS, DHH-250-BS, DHH-280-BS, DHH-315-BS, DHH-355-BS. Features: ✅ Air supply range from 4 to 160.9 m3/min. ✅ Power from 11 to 355 kW. ✅ Working pressure from 40 to 161.98 kPa. ✅ 100% oil-free: The compression chamber is completely oil-free and meets class 0, it provides users with clean and unpolluted low-pressure air. ✅ Intelligent controller, support RS485 communication and joint control. Allows you to remotely and wirelessly access your device from PC, tablet, mobile phone and check the working status of the device at any time. ✅ Low noise: Professional individual muffler of the inlet and outlet, the whole unit is completely enclosed by a soundproof casing, which is 30 dB(A) lower than the noise level of the Roots blower.