hi I'm am looking for information and help on repairing a roof vent on a older caravan. it is a Abby Aventura 330 six berth. during very high winds a number of caravans were damaged by flying debris. the bathroom roof vent on mine was damaged and i am looking to replace it but i am unsure of what size i need. the internal opening is 380 x 380 so don't know if i need a 400 x 400 cover. any help would be appreciated.
thanks
Stevie
thanks
Stevie