Question

Dust gathers on a surface , if not cleaned for a long time. why​

Answer 1

Answer:

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A dirty or low-quality heating, ventilation, and air conditioning (HVAC) system is a major cause of excessive dust. If you rarely have your ducts cleaned, dust, debris, and fungi will reside in your HVAC system. This debris clogs HVAC filters, resulting in excessive dust and unhygienic air, which can cause sickness