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Hi,also you may need to consider the reason for needing it, If it is merely ventilation,even that size of fan,may be over-kill. If you intend to have air-change,and not just wafting around stale air,then you will need an "in" and an "out". A ten watt fan will exchange all the air in a vehicle that size,very quickly,and it will be swapped for the air outside,at the external temperature (4 degree out=4 degree in= 4 degree dog)
I have lots of pals in the van/camper/dog transport job,and the best trade-off of heat/ventilation etc,seems to be trickle vent high up,and insulate the van.
Just don't permanently obscure the wiring looms in a T4.....because at some stage,you WILL need access to it
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