I want to install the 4" Nicro solar vent in my '86 Westy.  I've
seen some discussion on the list but no specifics.

Seems best to cut the hole in my existing vent material, but
I have the double-walled vent, so that doesn't seem practical.
I'll cut the hole in the roof if necessary.

Anybody have advice on this?  

TKA,

Steve

[text/html]