选择方形的窗户排风扇，尽量排除别的类型。 选择适合你家窗户的最大号风扇。 安装双数的排风扇，使空气能以最大限度流通。

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Box window fans have flat sides and blow air in a single direction, which makes them ideal for blowing a steady stream of air into or out of your home. Visit your local hardware store or home-improvement store and look at their box window fan selection. While other types of fans, like circular rotating fans, are great for moving air around inside your home, they’re less effective at bringing in air from outside. A larger fan will move more air than a smaller fan. Look for fans that will take up