This article contains the FAQs for the HD400 Series Shark FlexStyle™ Air Styling & Drying System. This supports the following SKUs: HD400, HD410, HD420, HD430, HD430C, HD435, HD442BK, HD440BK, HD440CCO, HD442OR, HD463H, HD440, HD435REF, HD453CO, HD430REF, HD450TL, HD442PL, HD442BP and HD400BK.