Hey whiplash i have fitted a bilge blower to our van but have not yet been able to test it. With the door vent blocked (when travelling) should be good as it pumps heaps of air out the top side wall vent and range hood vent. I also vent around and removed all sealant around pipes through the floor and re-sealed mine as they were fairly hit and miss from the factory. there are some pic's here http://www.expandasdownunder.com/threads/van-pressurized.4914/#post-70783Just wondering if anyone has built a positive pressure system for the work n play by any chance? I'm doing the Gibb next month and going to need something for the dust. Wanting to get ideas