Airflow Comparison, Ep 1: 5 Fans, 12V, 120x25mm (Gui & Jing, JMC, WDERAir, Wathai, WGMHEFUN)

=Gui-And-Jing GAJDH12025B
=JMC 1225-12 HB-A P/N 1202611-4
=WDERAir 12025 USB with 3-speed switch
=Wathai Waterproof (IP68), Dustproof 2-pin fan
=WGMHEFUN 120mm USB fan with pot speed controller (with and without plastic grill)

The long-awaited series has begun, in which you'll see some preliminary numbers for airflow and decibels. Please look at episode 3 to discover this episode's pressure differential.

Note: I'm using CMH for units of measure of airflow. A lot of companies use CFM even though almost every other spec is in metric. I would like to know how you feel about CFM, CMM and CMH. CMM results in very small numbers, which is why I chose CMH. Also, CMH is the 2nd most common unit of measure.