Winter vent covers, fitted inside or outside?

I understand the subject of vent covers was raised on this forum last November? It doesn't take much to confuse me but trying to find the availability of grey vent covers. Illustrations in both Thetford and A/S user manuals shows fitment of cover inside of grill and outside? However, could save money by cutting out template (allowing some ventilation) of similar plastic (as recommended by other blog) and fitting it underside of drop down outer grill on side of van. Has anybody purchased the seemingly illusive grey covers or made their own?
Regards

Grey ones available here..

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Ours came with the van. (Superior dealer???) They are not too expensive if you shop around.

All they do is cover nearly all the slots, leaving only the top row open. As indicated on the other threads, it ain't rocket science to remove the existing covers and put a bit of duck tape over the inside of the lower vent slots.

That's what I would do if I didn't have the proper covers! I wouldn't bother with templates and bits of plastic. It obviously doesn't get very hot or the proper covers would not be made of plastic, so I can't see a safety issue. If you are not too confident, leave two rows of slots open.  

Dave  

I Bought the white ones (cheaper than grey) and look quite smart fitted to the grey vents, the van is white, graphics grey so doesn't look amiss.

John.

Much obliged guys,  your suggestions are most beneficial.
Colin

I'm not even sure they are strictly necessary.

As far as I can discover, their major (and perhaps only) function is to prevent the fridge from working too well in the cold weather. They reduce the air flow over the cooling fins so there isn't excessive cooling due to the very cold ambient air.

Logic would suggest that you just turn the fridge thermostat down a bit - but having never tried it I can't say for sure if that would work.

Someone will know!

Dave

Thank you Paul, in a round about way, found grey vent (62445525) on eBay at £17.99 each so ordered two. Am confident that these will fit as I made a template of the inner gauze that matches dimensions of the winter vent. I I've had to dismiss the idea of all diy job at the insistence from the wife as she,  quote; ''You're not doing a botched job after paying out ***** grand!
Colin