This article contains the HC500/450 Series Shark® Air Purifier 3-in-1 with True HEPA Owner's Guide. This supports following SKUs the HC502, HC450 and HC500C.
On the bottom of your box, you should see the model number near the bar code.
The main body of the vacuum (back of the unit) should have a rating label that features your model number.
Your product's model number is listed on the front cover of your instruction booklet.