Why do we stipulation filter surrounded by a vacuum cleaner?

I accidentaly left the filter out of my vacuum and it still sucked up everything out of my hearth rug and into the slot all the dirt go in the vacuum.


Answers:    if you didn't own a fiter system on the vac. then as you are sucking up the dirt afterwards you would be blowing it back into the room from the exhaust of the vac
i guess they're to verbs the air.
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