On Wed, 23 Nov 2011 22:25:21 -0500, "J. Clarke"
wrote:

In article ,
says...


I like the idea several have posted using PEX. There is also a PVC
designed and rated for air
http://www.aetnaplastics.com/product...roPipingSystem

And anybody who has never worked with PEX is in for a treat. Stuff is
amazingly easy.

PEX is possible.

The special Air rated PVC is made for piping up chemical refineries
where regular steel pipe would dissolve in weeks and they have to use
Plastic and Fiberglas and Stainless to build the whole place. And
AIUI it's HELLACIOUS EXPENSIVE. Not for the price averse.

-- Bruce --