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Old 11-26-2008, 08:54 AM   #1
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takeoff location


I want to relocate several takeoffs from the ends of 2 trunks to the trunks proper.

Currently, all of the rest of the takeoffs lead off from the top of the trunks to take advantage of the joist spaces above.

Because of the direction of the joists, it is not possible to tie the relocated runs into the top of the trunk. In terms of effects on static, does it make any difference if the relocated takeoffs are tied into the sides or bottom of their trunk?

After relocation as described, are all runs in the trunk positively affected to the same degree, or only the relocated runs?

Thanks for your input.

V

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Old 11-26-2008, 09:07 AM   #2
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takeoff location


I see no reason not to move them. The end of the trunk line is not the best place for takeoffs but sometimes its the only place. You may want to add a damper wile you have it apart, just for grins and giggles

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Old 11-26-2008, 09:32 AM   #3
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takeoff location


It's not a good idea to have the takeoffs located on the end of the trunk. Top/bottom/sides are ok. The takeoffs on the end are getting the majority of the airflow unless dampered down alot so the net effect of the new design will increse the airflow to the other supplies on the side and decrease flow on the ones that were removed from the ends.
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Old 11-26-2008, 09:57 AM   #4
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Originally Posted by Daltex View Post
It's not a good idea to have the takeoffs located on the end of the trunk. Top/bottom/sides are ok. The takeoffs on the end are getting the majority of the airflow unless dampered down alot so the net effect of the new design will increse the airflow to the other supplies on the side and decrease flow on the ones that were removed from the ends.
Thanks, guys.

One run in particular, is at the extreme end of the trunk. It is the longest run, with many twists and turns, and with zero damper, gets minimal flow to begin with.

While the other runs (flow) are tolerable, is there anyway to increase flow to that end run? The trunk where it is located, is taken off perpendicularly from the first trunk prior to its end.

Thanks.

V
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Old 11-26-2008, 10:20 AM   #5
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takeoff location


The one on the end that currently has low flow may need to be either straightened or increase the size of the duct. The trunk may need turning vanes to increase the flow around the 90* bend from the first trunk. Do you know your supply static pressure?
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Old 11-26-2008, 10:59 AM   #6
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takeoff location


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Originally Posted by Daltex View Post
The one on the end that currently has low flow may need to be either straightened or increase the size of the duct. The trunk may need turning vanes to increase the flow around the 90* bend from the first trunk. Do you know your supply static pressure?
I had my system replaced this spring as well as a new, larger return drop, Aprilaire filter, and larger return grills. Can't lay my hands on the figures, but recall that TESP was right around .6 in second stage a/c (4 tons).

My new furnace is a Rheem Mod and so far, except during recovery, I usually can't hear it running. Even at full blast, it is putting out 1200 CFM in heating, where the original was supposedly putting out 1600 (very noisy) for a/c. Heating didn't seem any quieter (didn't know actual CFMs).

The original duct system was probably designed by a drunk, but even though a little more air in a couple of runs would be nice, airflow and consistency of temperatures is much improved.

If it were possible to (relatively) easily correct the one or two runs, it would be nice. The one run at the very end--it might be possible to enlarge the duct for the exposed portion (about 1/3). Would this be beneficial? Thanks again.

V
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Old 11-28-2008, 02:22 PM   #7
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takeoff location


Keep in mind no ducts should come off the last 18" of the main trunk.

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