Is 2 roof vents enough for cooking or do we need extraction fan?

[Merc camper]

We have lwb mercedes sprinter with good sized gas and electric cooker. We have recently put in two fiamma 400 x 400 roof vents, anybody know a good extractor fan needs to be small size or do you think roof vents would be adequate?

 

[Two on Tour]

Fiamma do a fan version of the 400 x 400 roof vents.
I have a couple of boxed new one's if you want replace the one's you have fitted already with the fan version.

 

[Merc camper]

Thankyou kindly for offer but want to be able to open up the vents for light. Just wondering if any smaller ones around maybe a solar version

 

[Two on Tour]

We had MPK roof vents on our Elddis when we got it and we were not keen on the trapped cooking smells and the heat build up in the kitchen area, so I swapped it out for the Thule Omni-Vent fan vent which was an optional extra on new vans.
The vent has a clear wind up top as does the Fiamma version so you still get light in but reduced air flow compared to the non fan version when the fan is off but the advantage of increased air flow with the fan on, plus you can either have them pulling air in or pushing air out.
I also replaced the vent in the bathroom with the fan version which keeps it clear of condensation and dries it out quicker.

https://www.homesteadcaravans.co.uk...mnivent-ventilation-and-extraction-system.htm