The Vortex One-Piece Liner Leads The Way With The Industry S Only Adjustable-Depth Installation. Vortex Is Designed To Extend Up To 3-Inches Towards The Front Of The Custom Hood Canopy So You Can Install It In Spaces Up To 20-1/2" Deep. Add To This Its Category-Leading 390 Cfm, Optional Recirculation Kit And Its 36-Inch Mounting Height Maximum; Vortex Stands Tall Among The Rest.