The Vortex Insert Leads The Way As The Industry'S First Adjustable-Depth Insert. Vortex Is Designed To Extend 3 Inches To Accommodate Custom Hood Depths From 17-1/2 To 20-1/2 Inches. Add To This Its Quiet, 390-Cfm Blower, Dual-Level Lumilight Led Lighting, And Optional Recirculating Kit - Vortex Stands Tall Among The Rest.