On the basis of ensuring the air conditioning effect, the installation position of the air conditioner indoor unit and the direction of the air duct are determined.

在保证空调效果的基础上，把空调室内机的安装位置和风管走向确定下来。

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There's a second alternative: A growing number of New Yorkers are going for duct-free AC systems that involve a small, wall-mounted indoor fan powered by a separate outdoor unit the size of suitcase.

WSJ: Ugliness for All