Fan noise is the most primary noise fountain in the continuous wind tunnel.
风扇噪声是连续式风洞最主要的噪声源。
An optional backup vent fan operates in the event of a primary vent fan failure.
如果主排气扇出现故障，则备用排气扇将启动。
This increases the initial primary air fan size and reduces the forced draft fan sizes.
这会增加一次风机的尺寸而减小从动风扇的尺寸。
This increases the initial primary air fan size and reduces the forced draft fan sizes.
这会增加一次风机的尺寸而减小从动风扇的尺寸。
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