On 10 Apr 2006 01:08:52 -0700, a particular chimpanzee named
randomly hit the keyboard and produced:

Consider instead, some form of passive stack or mechanical whole-house
ventilation

How much is this going to cost me?

I don't know; why don't you ask the companies who manufacture them?
--
Hugo Nebula
"If no-one on the internet wants a piece of this,
just how far from the pack have you strayed?"