What causes the machine to go off and on randomly?

It has a sensor. Or u can set the larger one, to automatically sense when u are near it. Or I have it set to tap the piece at the bottom to go on. It turns off automatically. It works great!

Do I need both filters?

The unit comes with both filters and they are cleanable so the only reason you would need extra filters is if you clean the intake filter and do not want to wait for it to dry before the next use. The exhaust filter is only a screen and is easy to clean and dry so there is no need for an extra unless it were to get broken. I purchased both as extras because things do happen and I don't like to wait to use things if I don't have to. You can order others later if you need or want them. Hope this answers it for you.

Where does this filter go?

this filter goes in the exhaust slot on the lower right hand side where you will see a lot of holes for the exhaust, it just pulls straight up and out of the slot.

ASIN	B007X6PF4A
Assembly required	No
Batteries required	No
Best Sellers Rank	#309,498 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #290 in Commercial Upright Vacuum Filters #3,653 in Replacement Upright Vacuum Filters
Customer Reviews	4.5 4.5 out of 5 stars (231)
Is Discontinued By Manufacturer	No
Item Weight	0.634 ounces
Item model number	EV-EF
Manufacturer	Eye-Vac
Number of pieces	1
Product Dimensions	5.5 x 0.5 x 5.5 inches
Warranty Description	Lifetime limited.

Eye-Vac Professional Exhaust Filter

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