One other thing about a fan in a wind.....the harder the wind blows, the faster the blades spin. So it actually is designed to easily move in a breeze to protect it's blades. I have had fans on a front porch for 30 years on the coast. Never worried about the blades because of the spin. If it was kept from spinning, then you have a blocking of the wind and the fan blades and motor would become a projectile. BTW, I grew up on a farm with a very tall windmill. Prairie winds were extremely strong. You never tie down the blades or vane to avoid the tower destroying itself.
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