What is the theoretical limit that a fan blowing air out of an enclosed space can drop the air pressure inside the space to? (Can use layman’s terms)
In: Physics
In theory, a specially designed vacuum pump could pump out all of the air, and drop to 0 psia (standard air pressure is 14.7 psia). But it requires being able to move molecules without letting any air back in.
But a fan isn’t going to be able to do that. Fans can vary their performance immensely with size, power, and design, so you won’t get a good answer. You also won’t get a good answer because houses aren’t airtight, so air would always be coming into that space. However, most fans you’d be able to buy would have trouble dropping the pressure of a completely sealed chamber by 1 psi, as fans aren’t good at creating very large air pressure differences.
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