Replacing Roof Vent

We have a 1990 Talbot Express Auto-Sleeper Harmony that was originally bought in 1990  - H Reg.

We need to replace our roof vent over the kitchenette. The measurements from the inside of the unit measures 450mm x 450mm in total / the internal opening in the unit measures 370mm x 370mm. On looking around I see that the only MPK unit that would come close is the 400mm x 400mm. Can anyone tell me if the sizing changed between the 1990 installation and this later / current sizing ...or would the 400 x 400 fit as that is the aperture size once the unit is removed?

Alternatively if anyone can suggest a breakers that may be able to help? Caravan breakers.net could not help us but there must be others we could contact?

Thanks

Mark

Have a look on ebay, there is a guy breaking 4 alledged AS vans around that age.

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Good luck.

Norman

I replaced the domes on a 1995 Exec with new ones and found only minor changes to the design which involved filing a piece out of the brown plastic handle to enable it to latch properly.

I personally wouldn't bother with breaker parts, as the older domes had a heat deformed fitting to attach the handle mountings to the dome, which broke up and leaked the water trapped exactly where the seal was.
The later domes have a moulded fitting rather than an attached one, so more leakproof IMHO.

New domes aren't that expensive, in fact here's one that you can have if you send a courier to pick it up.
I replaced it with a Mini Heki on our new Exec a few months ago.
The pictures show the underside (with already modified handles)




and the top with later/leakproof attachment moulding.

Would prefer to replace with new but think the aperture size may have changed - my current roof vent measures 370 x 370 internal opening space and 450 x 450 overall from inside...think the only available ones that come close are the 400 x 400 MPK types - I don't know if this will fit?

I replaced the roof vent in the bathroom and the one above the kitchen on my 95 Duetto. I bought mine from Magnum Motorhomes. They have a selection of sizes and the sealing tape. Not too bad a job and it was I did not have to climb on the roof to fit the  the larger one. I think there are threads on the forum about changing them.
The bigger one was not too heavy to be posted to you.

rattleman wrote:Would prefer to replace with new but think the aperture size may have changed - my current roof vent measures 370 x 370 internal opening space and 450 x 450 overall from inside...think the only available ones that come close are the 400 x 400 MPK types - I don't know if this will fit?

I'm pretty sure that they haven't changed, they were always 400x400 AFAIK

If you want to check the actual aperture size then just remove the screws holding the bottom half of the original vent and you'll be able to measure the roof opening.

The one in the picture is new, but then I replaced it after a few months with the Heki at the front to reduce wind noise.