Stumbled across 2 videos on You Tube and thought there's a lot of potential for them.
Cut and paste this "Homemade 12V DC Box Fan! - Full Size! - 100% solar!" into the YouTube search box for a car radiator fan adaptation. I think there is a lot of potential for loft growers who want to up cooling. What is more is that it comes on when the sun is out, exactly when it is hot and more cooling is needed.
"How to Make High Performance Sound Absorption Panels for $5" This is done by a guy who had done decibel tests. TL;DR version: Build a thin frame and stack and secure towels in the space that is the depth of the frame, hang on walls.
Both are very budget conscious but also relevant to growers. Hope you like them.
I am most keen on the solar fan, but the panels ain't exactly cheap.
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