They are usually worn by workers with long sleeve jacket uniforms. They need to cool down during summer when it gets really hot and they need to wear their unif

They are usually worn by workers with long sleeve jacket uniforms. They need to cool down during summer when it gets really hot and they need to wear their uniforms. Ordinary people do wear them and remove the sleeves and they are not that loud. You wont even notice them unless you see the fan. The DIY jackets with fan are the loud one, I've seen a couple them.