On Sun, 06 Jul 2003 11:10:26 -0500, "David W."
wrote:

Care to back that statement up with some facts? Flexible ductwork is used
extensively in many areas. In large parts of Texas,for example, houses are
build on slab (no basements). HVAC ductwork is necessarily run in the attic
space. The flex duct is both easier to run around roof framing and
insulated for added efficiency. Running standard sheet metal ductwork and
insulating it would be prohibitively expensive, and probably impossible
with a trussed roof.

We have a house on a slab with standard sheet-metal ductwork. It
obviously isn't impossible, even with cathedral ceilings and a trussed
roof. Actually, everyone in my neighborhood has the same.

Our new house, again on a slab, will have flexible duct but it's
wrapped in heavy insulation with a silver covering. The OP was
describing bare black duct, I believe.

Mary

--
Mary Shafer Retired aerospace research engineer

"Turn to kill, not to engage." LCDR Willie Driscoll, USN