Dust Prevention in caravans

A fan on the inside of the van is not going to create inner pressure,all it will do is circulate the inner air,
Best way to create a little inner air pressure is to have a forward facing roof vent slightly open and all windows closed,
Have you ever been in a car with all windows closed and switch the air vent from Recirculate to circulate , you will feel the pressure in your ears, An open roof vent will give same effect.

,

Phoenix have a presureising system fittet to some of their later vans, don,t have any details and have had no feedback on them but they are at the Sydney show if you happen to be able to get there. Maybe they have something on their web site!. Cheers,
Nev

elross,
It will work if the fan is big enough.

The dust pressure system on our Phoenix's works. We've only had a light layer of dust in the back bathroom which comes in from the roof vent, this area's closed off and doesn't get the full pressure effect.

The fan blows in an enormous amount of air. You can feel air rushing out the vent in the entry door when it's on.

It's controlled from a simple switch in the vehicle. This is good for roads that are constantly changing from dirt to bitumen. e.g. Birdsville to Mt Isa.

The intake is located high up on a side wall, I'd prefer it on the roof. The unit has a simple repco air filter which can be removed and cleaned.

Because the vans are made pretty well airtight to begin with, the pressure does build up. We don't need to tape up or close off the gas vent in the entry door. We do put foam in there in case the fan stops.

Some air will escape through the roof hatches like the 4 seasons and fantastic, which are not designed to be airtight anyway, as per gas regs I'm told. But with the fan on, air is going one way - out.

Scupper vents don't make sense to me because they let in dust from the vehicle and oncoming traffic. If a filter is fitted to these it does work.

Oh and us boys don't mind the dust Doug, but we came across a van owner at Bedourie and his wife was NOT happy.

Saw another very upset lady at the B'ville CP who owned a well known brand of off-road van, her comment after doing the B'ville Dev Rd - "look at all this dust inside, off-road van my a_ _ e!" :-(

Cheers
John

elross, is that an "elross" van from Perth you're having made?

Will be interested to see what you think of the finished product.

I have aTrakmaster and the first thing we did was put duct tape all over the vent on the bottom of the door, a foam insert in other thru-wall vents and we use the scupper vent on unsealed roads if we are going fast enough otherwise we close it.

Be aware that these vents I closed off are required by law because of gas appliances etc so if you close them off make sure you have windows open when you camp and that you turn the gas off at the bottle when you set off.

cheers

have a 12volt fan in my camper that sucks air from the outside thru a holden air filter to the inside & pressurizes the camper & it works great but you have to clean the filter every day as it blocks quickly (I just blow it out every morning & the Fan is a Nissan electric radiator fan from the wreckers $25)
regards Vince

If you have a fan set up pull the air from the out side trough a donaldson air filter, this is what the large denning coaches do for their luggage bins under neath. They have a donaldson mounted on the bullbar and a large fan in the bin, i have driven these coaches over the plenty high way and get no dust at all, but when they break down the bins are full of dust. Col