Airflow through 3.5 tonne

Just ordered two from Amazon. The rechargeable fans. Thank you. I know it’s an older thread. But my mare was dripping yesterday. Hoping they will help. And got to be cheaper than paying for windows
 
I realise that this is an old thread, but it has actually been really helpful. My new (to me) lorry has a roof vent & I've been opening it the wrong way round i.e. cab side open as I thought (the amount of science I understand would fit on the back of a stamp...) that it would scoop in more air. I shall go & sort it out! :) and I might get some fans as well.
 
Annoyingly I had to have my roof vent replaced with a new one and it opens far wider than my old one. How wide does everyone elses vent open? I'm worried it opens too far and could get pulled off by the wind, especially on a motorway.
 
@SEL whats your portable battery charger thingy, is it just a power bank like you have for a phone ? Thanks
Exactly that. Yesterday it charged the fan before we left then I plugged my phone into it because Google maps drains the battery badly.

I can watch the ponies on camera turn their faces to the fan so they do like it.
 
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