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There are several different builds below. No matter which one you choose make sure you put a shroud on the front of the fan to enhance efficiency.
Here is a 4 filter build known as the Compretto Cube: hosted by Philip Neustrom. This diagram is just a sample – very well-done build site!


Here’s another 4 filter build from Don Blair, citizen scientist in the Boston area. Great Work Don! Great NPR article on this.


PNG of this poster.
Very handy PDF download here.
Here’s a video on how to do it from This Old House:


Here’s another video build:


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