Hoi URIDE4LIFE ! Nice design, I’ve a vertical and horizontal design. The
horizontal design needs to be powered with fans because the air is not
going automatically to the top. But with the vertical design, like yours,
there’s a big difference while using a fan or not to heat up my
Good job, nice looking solar furnace. If you care to, check out CDT Solar.
You can get a quality 200CFM fan, and solar panel to power it for $200.00.
That would increase the amount of heat entering the building dramatically,
and you would still be going green. You would have to also get a snap disc
so the fan would not run when the furnace was not hot. My solar furnace is
the same size and I estimate I am running from 250-300cfm through it, and
it runs continously when the sun shines.