The air outside is hot, so is the air drawn in hot?
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The high temperature of the air outside is because the sun irradiates the air, which makes the its temperature high. If the air is in a shaded place, the air will not as hot as the one under sunlight. If there is air convection in the factory, it is like as cool as under the shade of a tree. The negative pressure in the factory makes the air flow, and the temperature will not rise sharply due to the air flow. The resulting wind will accelerate the heat dissipation of the skin, so there will be a cool feeling.
