Don't have on in my hand, so measurements are nowhere near accurate, but
they are approximately 2.5 x 4 inches (about the size of a poker card).  The
trick is that in cross section, they have a lip, sorta like this
^------------------^  .  The lip fits around the perimeter of the plastic
flap, or more precisely, flap halves, since two of them snap together around
the spindle, and actually makes the seal.

Thanks,

Karl Wolz

----- Original Message -----
From: <Vgonman@aol.com>
To: <wolzphoto@worldnet.att.net>
Cc: <vanagon@gerry.vanagon.com>
Sent: Sunday, October 24, 1999 11:16 PM
Subject: Re: heater flaps (not FLAPS)

> Well assuming it's just some foam rubber strips with adhesive on one side,
I
> may have something for you. A while back I was replacing an exterior door
for
> my house and while I was at the building supply store (in this case Home
> Depot) I found some (I believe) 3/4 in wide, 7 or 8 ft long strips of a
foam
> rubber-like substance for weatherproofing doors. I'm sure that with some
> trimming this would work for the heater ducts as well.
>
> Sean B.
> '90 V'gon, "Happy Bus"