This article contains the HD400 Series Shark FlexStyle™ Air Drying & Styling System Style Guide. This supports the HD400, HD430 and HD435 SKUs.
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.