请问,这个时候还可以做duct clean吗?

You could do it anytime. But there are some research show there is no need for duct clean. It wouldn't improve your air quality.
 
You could do it anytime. But there are some research show there is no need for duct clean. It wouldn't improve your air quality.

I have the same feeling. Is duct cleaning necessary in improving air quantity? Your experiences and comments are welcome.
 
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