Two control ring work together to realize variable speed constant frequency.
运行时机组的两个控制环同时工作，实现变速恒频。
Host fan with variable frequency control, steady speed, low power, accurate and reliable.
主机风机采用变频控制，调速平稳、省电、准确可靠。
Host fan with variable frequency control, steady speed, low power, accurate and reliable.
主机风机采用变频控制，调速平稳、省电、准确可靠。
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