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