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Old 06-21-2012, 06:22 AM   #1
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Ceiling Air Supply Location


Is there a correct location for HVAC ceiling air vents?

My duct work is in a standard vented attic. The R6 flex duct runs 15 feet across the bedroom with the air supply vent over a window. Why would you subject the duct to extreme air temperatures by running it an extra 10-12 feet?

The purpose of the duct is to get conditioned air, warm or cool, into the living space. Wouldn't it have been better to place the supply vent at a location that would get the air into the room as quick as possible? In my situation, placing the vent on the opposite wall would save about 12 feet of duct work.

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Old 06-21-2012, 07:00 AM   #2
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Ceiling Air Supply Location


is there a return? I suspect putting the duct in the farthest position from where air is returning to the furnace and/or AC would allow the most cubic area of the room to get conditioned.

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Old 06-21-2012, 07:50 AM   #3
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Ceiling Air Supply Location


There is a return in the ceiling outside the bedroom door.

To me, it seems better to blow air into the room and have it circulate back out the door to the return instead of blowing straight out the door.

Not sure why this seems important to me, but I'm concerned about the heat gain/heat loss from having extra ductwork in the attic.
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Old 06-21-2012, 08:15 AM   #4
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Ceiling Air Supply Location


You don't just get the air into the room....you get it where its needed. The place it is needed is where the load is the greatest by the windows and exterior walls.

The second half of the design is choosing the right size outlet and the right distribution pattern ....and in my experience only a miniscule fraction of contractors know how to do this
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Old 06-21-2012, 09:26 AM   #5
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Ceiling Air Supply Location


The place it is needed is where the load is the greatest by the windows and exterior walls.


Yes, and couldn't that be done by directing the airflow towards the wall and window instead of away from them?

If the supply vent is moved to direct air towards the exterior wall and window, and also decreasing the duct lenght, wouldn't that increase the efficiency of the system? For Summer, cooler air into the room by removing the added heat gain and air at a higher velocity and CFM by removing 12 feet of flex duct.
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Old 06-21-2012, 02:39 PM   #6
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Ceiling Air Supply Location


12 feet is a long way to silently blow air thru a grill and have it reach an outside wall. Round outlets don't have to be put at an outside wall....but they are great for a cooling climate and are terrible for a heating climate....

If your registers go in the ceiling you are not going to get throw to the exterior wall.
If you use sidewall registers-you may get the throw to the outside wall....but you need the space to get the duct into the wall or duct below ceiling level.

Last edited by Technow; 06-21-2012 at 02:46 PM.
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Old 06-21-2012, 07:49 PM   #7
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Ceiling Air Supply Location


Many ceiling registers will only have a throw of 6 to 8 foot. In winter, if the wall is at the very end of the registers throw. Then there won't be any skin to help the warm air to travel down the wall.

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