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Old 01-25-2012, 07:49 AM   #1
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Splitting up a room into pieces


Hoping to find some HVAC help..... I have a 20 x 20 finished room that I am dividing up into (2) 10 x 12 rooms and an 8' x 20' common area (landing at the top of the stairs.

Currently there are two ducts dumping into what would be the common area.
I would like to take one of those and split it between the two rooms.

The easy way would be to somehow move and drop one duct into the dividing wall between the rooms and have it open to both sides.

Any thoughts would be appreciated

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Old 01-25-2012, 08:30 AM   #2
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Splitting up a room into pieces


Quote:
Originally Posted by 2fullgarage View Post
Currently there are two ducts dumping into what would be the common area... Any thoughts would be appreciated
Are these main trunk ducts? or branch ducts to registers?
Trunk ---> Branch ---> register

Usually the trunk is run perpendicular to the joists...
with the branch duct running off of that in the joists.

Lay out the trunk duct relative to the joist layout.
Think about exterior wall & window placement (where registers need to be).

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Old 01-25-2012, 02:07 PM   #3
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Splitting up a room into pieces


They are 2 separate branches. They are the first two branches off of the main trunk. That room is also the only room on the second floor. It is either the coldest room in the house or the warmest (I live in Florida).

The main trunk is far away and in another roof section. I can't see it unless I go into another attic on the first floor. I will need to go up and measure those two duct diameters anyway
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Old 01-26-2012, 08:15 AM   #4
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Splitting up a room into pieces


sooooo.....Is there some kind of plenum that I can run from the duct I moved in the attic down between the 2 split rooms and put a register on both sides of the wall?
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Old 01-26-2012, 10:59 AM   #5
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Splitting up a room into pieces


Remember to look at the outlet placement and the direction the heat will flow to when leaving those outlets. Heat rises and heads to towards the return grill.
Try to place the heating outlets closest to the floor and furthest from the open door, return air grill, or staircase to a landing that will act like a chimney.
That room that gets hotest or coldest probably needs a return air run.
If you are planning on having doors that will be closed on the two rooms then you need to account for them pressurizing against the air flow. They'll need their own return air or a 1''gap on the bottom of the door to be able to access another house return air.
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Old 01-26-2012, 02:38 PM   #6
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Splitting up a room into pieces


Thanks How....My unit is a NGas furnace/AC, it all goes thru the same ductwork. All of my outlets are mounted in the ceiling. The heat is on Dec/part of Feb maybe only a few weeks or so total.

I just need to figure out how to get the one round duct in the attic split into the two rooms. I have been looking for something that goes down the un-insulated wall maybe a few inches to a foot and then has registers on both sides of the wall.

The doors of the 2 rooms are at on end with windows at the far end. I am thinking the outlets should be half way thru the room on the side wall
between them

http://i1150.photobucket.com/albums/...fore-after.jpg this is the before and proposed after the current vents are only in the before

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Old 01-26-2012, 04:20 PM   #7
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Splitting up a room into pieces


Using a single duct in the wall to supply to adjacent rooms, will allow a lot of sound transfer from one room to the next.
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Old 01-31-2012, 06:34 AM   #8
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Splitting up a room into pieces


Sound transfer.......good point, crap.

Well I crawled into both attics and the 2 current ducts are actually one duct of the main trunk that his a triangular splitter box and then goes down into the current two locations.....now I am stuck (with what to do now)
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Old 01-31-2012, 03:18 PM   #9
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Splitting up a room into pieces


Don't forget. Those rooms won't heat or cool right, without returns either.
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Old 02-02-2012, 07:11 AM   #10
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Splitting up a room into pieces


There is no return up there, guess I am screwed all around. I assume the builder thought flow back down the stairs was the return. All I wanted to do was split up a bonus room with some studs, drywall and sprinkle in a few outlets. All Stuff my wife and I thought I could do....Now I have a HVAC can 'o worms
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Old 02-02-2012, 03:16 PM   #11
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Splitting up a room into pieces


Might want to try using transfer grilles.

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