On Fri, 18 May 2007 17:25:53 +0100, Lurch
wrote:

I guess running it through a wall to spill onto a
public pavement would be a no-no,

Your guess is wrong.

You sure? AFAIAA you're not allowed to discharge anything onto a
public area, fans, flues, wastes etc...

Hoping someone will clarify, as my C/H boiler flue comes out above a
public pavement...

Jim