Honestly no need for a solar fan-get an electric fan/the cost of running a fan is really small & if anything goes wrong, it can be repaired from inside the attic.also it has a much greater CFM than any solar powered fan--finally you can buy a good one and any reputable roofer,electrical contractor can install it
IMHO, the cost of a solar fan-is a real loser -most people in the villages will never live long enough to justify the cost
When I was an electrical contractor-my company installed thousands of electric attic fans
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