Direct drive fans are available for many applications, and can reduce maintenance needs.
直接驱动风机得到了广泛应用并可减少维修需要。
Magnetic, direct d. c. drive built for continuous, maintenance free operation.
直接磁力驱动技术，免维护，长期连续运转。
Magnetic, direct d. c. drive built for continuous, maintenance free operation.
直接磁力驱动技术，免维护，长期连续运转。
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