Using attic heat for the house

[Patrick]

Originally Posted by Daox

Alright, here is a rough picture of what I was thinking of. I am very much open to suggestions. I'd really love to simplify it, but I'm not sure how without sacrificing functionality and ease of building. Also, the flapper vents would seal better if they were oriented vertically (90 degrees rotated from how they are in my picture), but the air can only flow upwards then (so gravity holds it closed).

I like your design, except that I would probably put the filter in the top or end of the box to make it easier to change.