> Similarly, for moving motor vehicles, air always flows from the back to
the front and
> this is the basic principle upon which all vehicle through-flow systems
> work.

Absolute balderdash, kapiffle and tripe!

Clive
'88 Syncro Transporter

----- Original Message -----
From: "simon glen" <simonglen@BIGPOND.COM>
To: <vanagon@GERRY.VANAGON.COM>
Sent: Sunday, July 28, 2002 3:52 AM
Subject: Re: Just wondering

> Through-Flow ventilation
>
> In fact, those vents at the back of the rear side windows on later
> (1986-1992) Caravelles and Vanagons are not "exhaust vents" but ENTRY
points
> for fresh air.
>
> In the early days of steamships it was discovered that, when a ship was
> under way, air inside the hull flowed from the stern to the bow.
Similarly,
> for moving motor vehicles, air always flows from the back to the front and
> this is the basic principle upon which all vehicle through-flow systems
> work.  Even the little slotted aperture at the base of the front doors on
> later T2 (bay-windows) and all T3 (Caravelles, Vanagons, etc) takes in air
> from the cab interior and sends it through the door to the front of the
door
> where it is expelled through the slot between the door and the A-pillar.
>
> So, the best way to achieve a through-flow of fresh air through a Vanagon
or
> Caravelle is t0 have a rear-most side window open.
>
> However, if one makes the window at the rear door or hatch openable (as
> suggested with a safari rear window), one would be courting disaster.  Air
> contaminated by the vehicle's exhaust would be sucked in.  The occupants
> would soon develop headaches, fall asleep and die from carbon monoxide
> poisoning if they didn't first get wrapped around a tree when the driver
> dozed off.
>
> Simon Glen
> Toowoomba, Australia
> 1992 syncro van