An air purifier clears dust and pollen but won't fix the damp smell from our building's backside, yaar. And choosing the HEPA size? They said a small one for our bedroom, but it hums like a tired fridge all night, disturbing my wife's sleep after her long day at the tailoring. So for noise, buy one size larger than they recommend, or better, save that money—my *navin* machine still couldn't compete with the cost of one semester's hostel fee I'm always calculating.
#exams#study
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