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Posted by yummydude4u on November 21, 2006, 7:16 am
Richard wrote:
> > using same size will do fine
>
> Damn...and I exchanged that return
> air package for huge one.
>
> It took 3days to get this answer.
>
> tx
>
>
>
> > Hmmmm.. I've never heard of a heat load referred to as CFM..
> >
> > Lets see, how does the letters CFM relate to 'heat load"?
> >
> > Roman numerals maybe?
> > C= 100 ( if I remember correctly)
> > F= Cant remember any Roman numerals with that letter.
> > M= isn't that a 1,000?
> > So, I guess that's correct, 1000 + 100 = 1100.
> >
> > Learn something new every day!
> >
> > using same size will do fine
> >> My supply air trunk is 20"x10" with a heat load of 1100CFM. What size
> >> should the return air duct be?
> >>
> >>
> >>
> >>
Mr. Richard,
Don't worry.
The Contractor did the right thing. The Practice for return duct size
is to have the
Return Duct at least 20 percent larger than the supply air duct? Why is
this?
Simply because the pressure in the return section of every AC units is
induced
(negative). At this percentage of incremental area, the duct borne
noise are
minimize in the return side of the AC units.
One more thing about return is to have the shortest possible length of
the system
to avoid excessive pressure drop.
Hope this helps.
God Bless.
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