I had a completely new 2.0 ton EER 13 system installed along with all
new duct and mainline duct. On the return side of things, the duct
work does a 270 degree turn back to the air handler intake. If I
recall the sales guy told me that air doesn't like turns and it
decreases the speed.
So, now does this mean that 270 degree turn should be straigthened out
so that it's just a 180? I called the company and was told if it was
attached straight it would cause whistling. What's the real opinion on
270 Degrees?? Are we talking Farenheit or Celsius?
Either way, someone's going to get burnt!
Put your lawn sprinkler in your basement and turn it on full!
That should cool things down.
Let us know how things turn out.
I know you are double checking your new job but do not worry. The company
who installed it would not put themselves in a situation where they need to
go back under warranty.
They are right about the sound. When I use to install I would add extra flex
duct in the attic to cut down the sound of the blower assembly. I like to
increase my size of return, By code you would use 14" flex for a 2-ton
system but I would use 16".
I am assuming that the duct you are talking about is flex. Here in South
East Texas flex duct is used allot.
Bends cause pressure drop. Excess dressure drop causes a loss of
system performance to the point where it will eventually fail. Less
bends the better.
Noise (usually) generates from velocity (fast air in the duct). Most
domestic tech install ducting too small (saves cost) which results in
excess static and noise. To reduce noise, use a larger duct. If noise
is from fan deck (air bourne) a bend (with insulated duct) will
significantly reduce it. Noise doesn't turn, it goes straight or
Best of luck.
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