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Old 07-16-2010, 02:07 PM   #1
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Is there such an item?


I have a couple of runs (very long) that could use a little more airflow. I have tweaked the dampers to their optimum settings.

Is there a commercial product, I'll call it a 'scoop', which could be inserted into the takeoff to 'direct' the airflow (sort of a ram effect)? Currently, the takeoffs are taken from the top of the trunk and immediately elbow.

If no such product, what do you think of such an approach?

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Old 09-01-2010, 06:45 AM   #2
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Is there such an item?


There are scoops available, but also booster fans for long rungs that can be t-stat controled.
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Old 09-01-2010, 05:27 PM   #3
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Is there such an item?


You can get scooped take offs.

Sounds like you got some undersized duct work.
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Old 09-01-2010, 05:54 PM   #4
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Is there such an item?


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Originally Posted by beenthere View Post
You can get scooped take offs.

Sounds like you got some undersized duct work.
Problem was that they did not reduce the long run, should have went 18, 16 ,14, 12 that way static pressure would compensate.
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Old 09-01-2010, 06:13 PM   #5
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Is there such an item?


Reducing trunk line is only needed if the trunk is over 24' in length. As long as its not. no problem with velocity, or static regain.

If the problem is the trunk is over 24' and the near registers are the ones that don't get enough air flow. Then it should have been reduced. if its the far registers, then its undersized.
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