Water proof Ceiling Vent.

[John M]

If you are looking for a truly waterproof vent look at the various types of Dorade Vents available from ships chandlers, you can even make them yourself.
guaranteed positive ventilation and waterproof in all conditions, other than immersion.

[BobnBev]

I picked up a item from the states $165. $ 185 postage.....! still better than prices here... The women at the postoffice said to have it readdressed in the states and its much cheaper...
Like send it to someone else first, then have them send it on, yer right,
Bob n Bev....

[Kelvin12]

Looks like the 4 seasons is the best option after quite a few inquiries. US freight costs pretty well killed that option. Probably the main decider was the meeting gas regs when closed. There is now a rain / wind deflector strip that goes across the front of the unit which is supposed to stop the leak problem when underway. The additional choices in the interior garnish trim up to 80mm suits my aplication as well.

Thanks for all the input from everyone.

Dirk

[T1 Terry]

If you are looking for a truly waterproof vent look at the various types of Dorade Vents available from ships chandlers, you can even make them yourself.
guaranteed positive ventilation and waterproof in all conditions, other than immersion.

I've been thinking of a similar idea to the one Peter with the OKA used, an air ram type pick up on the roof with the pipe dropping down to a "U" bend with a small diameter pipe dropping outside and one of those rubber flapper valves on it, then the inlet back up near ceiling height. That would produce the air flow required for the gas side and a forced air feed resulting in a bit of inside pressurisation to push the dust out of any leaks rather than it being sucked in, maybe a cabin filter cartridge with the sticky paper and carbon thing inside to filter out the dust and stuff at the cabin inlet end, not sure if that would bugger up meeting the gas requirements though.

T1 Terry

[Kelvin12]

Terry,

You don't think the S type sort of bend would slow the free air down to a dribble.

Dirk

[T1 Terry]

It would need to be around 3" pipe I'm thinking, probably plastic storm water pipe would do the job, what is the reqired area for the vent?

[Kelvin12]

Terry,

210cm's squared. That is for NE vent minimum. Bloody complicated to read.

Dirk

[Craig]

Hi Dirk,

You have quoted that 210cm previously and I thought it sounded very large. Do you mean CFM? (a measurement of volumetric flow)

Craig

[Kelvin12]

G'Day Craig,

Regs say, "Minimum of 420cm's squared total free ventilation area". "Minimum number of openings at each level 1". If I am reading this correctly then its 210cm squared at top and 210cm squared at the bottom vent. This is for an "over 6M caravan", everything is classified as a caravan for the regs. It does seem a lot though. 4 seasons hatch claims theres meets the regulations so must be around the 210 mark that being the case.

Dirk

[T1 Terry]

The vent in the bottom of my new Camac door is supposed to meet the new gas regs, it measures 38cm x 12.5cm = 475sqcm doesn't it? If that's the case then each vent needs to be a minimum of 420sqcm.
That's a big vent in the roof that needs to stay open at all times