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Posted by Noon-Air on May 29, 2008, 6:17 pm
> The system is existing, it is a forced air furnace.
>
> The ducting is all original, starts at 14" then down to 12" then to 8" to
> the registers.
>
> There is one leg that was previously modified by the previous owner that I
> am trying to improve.
>
> In one bedroom they moved the register to another wall in the same room.
> So what someone did previously, was that they cut the hard rigid line at
> the original register and added 10 feet of wire flex to the hard line and
> connected to the new register on the other wall in the same room.
>
> This room / register doesn't get the heat that the other rooms get. I
> have a Fluke digital multimeter with a IR temperature sensor. After the
> furnace has been running for about 20 minutes, I will go around and point
> the temperature probe at the center of the metal registers in all the
> rooms. I'll read anywhere from 115-125 F but in the room with the modified
> duct. I read only about 100F. Not sure when I am getting such a
> temperature drop, the run isn't long nor is the room much different,
> perhaps the loss is in the wire flex duct material?
>
> The airflow out of this modified leg also seems low but I have no way of
> measuring it. Would this be due to the resistance of the wire flex?
>
> This modified leg has a slight V shape to it, think a dog leg. The
> original rigid duct is pretty much inline with the new register, so I am
> thinking of cutting off the dog leg and adding new duct work direct to the
> register.
>
> My original post was to ask what material to use. I had two heating
> contractors out, one wanted to use 6" wire flex the other 8" Aluminum
> flex. after reading I think neither should be used. And to go with rigid
> line. I am not cheap. We are only talking about a 15 ft length.
>
> Any ideas?
yup... quit screwing around with it, get a complete Manual J and Manual D
calculations done, then have the correct size, super high efficiency,
comfort system installed and at the same time, get the entire duct system
ripped out and re-installed from scratch, compelete with air balancing. No
more problem.
--
Steve @ Noon-Air Heating & A/C
"Stop calling me for freebies Satan,
I'll fix your air conditioner when you pay me, Cheapskate!"
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