On Mon, 06 Dec 2004 22:25:41 GMT, "bill a"
wrote:

I will get someone to look at it. The existing equipment needs to be
checked out anyway.
thanks
Bill

"Joseph Meehan" wrote in message
.. .
Yes a manual D is a calculation method of determining Duct size. It is
the right way of doing it to make sure everything will work properly and
not cause future problems. I suggest you find some to do the manual D.

No, you don't need a manual D. Take the money you would waste on a
manual D and spend it on a nice thermometer and you will be far better
served. You live in the house so you can 'adjust' the air flow to
get it just like you want it. Anyway, A manual D doesn't account for
many of the variables that change the temperatures of various rooms.
(Like my dog standing with his head stuck out the doggie door or my
daughter taking a 2 hour shower with scalding water)