DIY Motorhome skylight vent fan

DIY thermostatically controlled roof light fan, variable up to over 1000cfm (!)

Sorry for the poor video work, I really need a camera and 3 hands rather than a mobile phone!

The items used in this project:-
300x300 white vent @ £6.50 https://amzn.to/3rl6uMi
10" 12v fan @ £15.60 https://amzn.to/3kDRcAI
Cig lighter power switch @ £6.50 https://amzn.to/2W6WElL (3m cable length available too)
10A speed controller @ £8.70 for 2x https://amzn.to/3iwEfpM
W1209 thermostatic relay @ £3.59 https://www.ebay.co.uk/itm/393110444436
SPDT switch (on-off-on) @ £2 https://www.ebay.co.uk/itm/254230122628

Then it needs a basic wood square 370x340 with a 10" hole in it - then just screws/wires together.