This article contains the FAQs for the HD400 Series Shark FlexStyle™ Air Styling & Drying System. This supports the following SKUs: HD430C, HD400, HD410, HD420, HD435, HD440, HD440BK, HD440BKCCO, HD463H, HD442OR, HD442BK, HD435REF, HD430REF, HD442PL, HD442BP, HD400BK, HD450TL and HD450TLC.