old2 Filter Build – Forms a Triangle – top and bottom are cardboard.

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Here’s one as a goal – it’s the same triangle filter as in the video, but with a shroud added for optimum performance, and adhesive contact liner layered over the cardboard.  Beautifully done!

This was what it looked like before the contact paper was added.

In this one, you’ll notice that the shroud ismade of tape.

Immediately below is the build thread ( make sure you put a shroud on the front of the fan to enhance efficiency):

Slightly different build.

Here’s a slightly different build. I like this one for the step by step instructions (make sure you put a shroud on the front of the fan to enhance efficiency):

Video Build

Here’s an alternate build video (make sure you put a shroud on the front of the fan to enhance efficiency):

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