I-March Expo Alibaba Liveshow Replay: Izihloko:Holtop Direct Expansion AHU Covering Topics & Time: 1.Iyini i-AHU?01:24 2.Direct Expansion AHU vs Chilled water AHU 02:08 3.Direct Expansion AHU Advantages 07:17 4.Holtop Ceiling Type DX AHU 11:00 5.Holtop Floor Standing Type DX AHU 20:00 6.Holtop. .