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Old 01-24-2011, 02:41 PM   #1
Tre
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Help: Need to add Return (see diagram)


Hi, I am new here and was hoping that you all could lend me your advice/opinions.

(please see the image below for a diagram, because explaining the setup is complicated). I have a rather unique and OLD house that is split into 2 units (Unit A: Front and Unit B: Back). The back unit is 2 stories (no basement), and the front unit is 1 story with a basement. Unfortunately it has only one shared HVAC (forced air gas heater / ac), which runs along one side of the house. The only return in the HVAC system is a large return grill in the upstairs hallway of of Unit B. There is a door that is pretty much sealed between the 2 units, and adding a return between the immediate walls would let too much noise through.

As a result, based on what I've read, there is too much pressure in Unit A, and the heat/ac does not spread well or far from the registers. If you have looked at the attached image, my idea is too add a return from Unit A's Basement that leads up to the first floor of Unit B. This way noise transference will be minimized, but the pressure will not build up and the circulation will allow the heat to disburse better in Unit A. Generally Unit A is 10 to 15 degrees colder than Unit B is (even with adjusting the dampers).

Is my idea a good idea? Any other options I should consider?

Any help would be greatly appreciated.

Thanks,

Tre
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Old 01-24-2011, 08:18 PM   #2
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Help: Need to add Return (see diagram)


If the return duct is large enough, yes it will work. However. Unit B will probably have a "cool" draft near where the return from unit A is.

PS: Is this a single family dwelling? Or multifamily dwelling. If multi, your already in violation of code. You need 2 units then. Or fire dampers in both duct systems.

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Old 01-24-2011, 08:46 PM   #3
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Help: Need to add Return (see diagram)


Thanks for the response. Funny story but from what i understand the house used to be "multifamily" but was poorly converted to a single family house ... Thus the strange setup. But the door is usually kept shut which restricts airflow. Anyways, what size return ducts do you suggest?

Thanks again!
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Old 01-24-2011, 08:49 PM   #4
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Help: Need to add Return (see diagram)


Where is the ducting for the basement of "A"?

Would have to know the volumes to size ducting
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Old 01-24-2011, 09:15 PM   #5
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Help: Need to add Return (see diagram)


There is no ducting in the basement. Trust me if i had the money i'd knock the house down and start from scratch. Sorry for my ignorance but by volume do you mean for each room?
Unit A 1st floor: 25 x 30 x 9 = 6750 cubic ft
Unit A Basement: 25 x 30 x 7 = 5250 cubic ft
Unit B 1st floor: 25 x 20 x 9 = 4500 cubic ft
Unit B 2nd floor: 25 x 20 x 9 = 4500 cubic ft

Thanks
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Old 01-24-2011, 09:17 PM   #6
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Help: Need to add Return (see diagram)


Fan volume in CFM.
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Old 01-25-2011, 02:49 AM   #7
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Help: Need to add Return (see diagram)


Same size as your current return duct in unit B. I know that may sound real big to you. But you want to make it as easy as possible for the air to flow from A to B.

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