Unfortunately, nothing fits this weird opening.  For ventilation, check out
the E+B marine catalogue.  They offer a number of powered and non-powered
vents that only require a 4 to 6 inch hole.  Some are even solar powered
requiring no wiring and can provide air flow while van is in storage.  Great
for helping the fridge keep cool when the van is locked during the day.
Most are designed to be open all the time and remain rain tight while open.

Dennis

-----Original Message-----
From: Treehouse <alvorada@CITYNET.NET>
To: vanagon@GERRY.VANAGON.COM <vanagon@GERRY.VANAGON.COM>
Date: Thursday, May 06, 1999 7:39 PM
Subject: Exhaust Fan

>Has anyone any experience with replacing the Westy skylight with an
>exhaust fan? In hot/humid conditions, I would like to have a little air
>movement in my 84 Westy for sleeping comfort. Since my skylight is
>broken, I thought I might replace it with a thermostatically controlled
>fan. I see they are available from several sources but the size listed
>is usually 14"x14" which, I suppose, is a standard size for RV's. Since
>my skylight size seems to be ~12"x16", I wonder if anyone knows of
>a fan that might fit or is it possible to modify the opening to 14"x14".
>
>Thanks in advance for any help.
>
>Larry Calhoun
>84 Westy "Greenbrier Billy"