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Old 01-26-2012, 10:55 PM   #1
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Return vents / air circulation question


I have a standard furnace with air returns in every room at floor level that I believe originally were heating output vents (1950s circa home)

For air circulation lately I leave the furnace fan on low all the time. My question is when on low is all the air draw coming from the nearest intake vents? That is how it seems.. ... Hard to know for certain., I don't feel air movement at the further returns. Ideally I want a slight draw from every room/vent..

So I'm looking for insights or ways to measure for better awareness. Thanks!

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Old 01-26-2012, 11:38 PM   #2
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Return vents / air circulation question


Are those returns under the windows with the heating vents closer to the center of the house or the opposite to this. Are those returns on the floor or the wall?

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Old 01-27-2012, 08:09 AM   #3
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Return vents / air circulation question


The lower vents in each room are in the wall just above the floor. They are often on exterior walls and room corners. The output vents in each room are often centered in the wall near the ceiling on interior walls. The returns are all metal ducts that aren't new, and the vents are runs of modern flex ducts up in the attic.

I just put 2+2 together to realize the returns & vents are often are as opposite as you can get in each room relative to each other!
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Old 01-27-2012, 08:40 AM   #4
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Return vents / air circulation question


Quote:
Originally Posted by Mrdippy View Post
The lower vents in each room are in the wall just above the floor.
They are often on exterior walls and room corners.
Low or high is a different issue from whether the registers at the exterior walls and usually under the windows... are supplying warm air TO the room or returning room air back to the furnace.

Quote:
The output vents in each room are often centered in the wall near the ceiling on interior walls. ...
Then your current system is installed reverse from "normal"... based on your earlier statement it appears that someone modified the system this way ("... that I believe originally were heating output vents").

Are you planning to have your (circa 1950's) equipment replaced soon?
Assuming so, plan to have the duct issues addressed then too.
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Old 01-27-2012, 10:41 AM   #5
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Return vents / air circulation question


Actually your system(though opposite from todays normal) was designed this way. You have to wonder why builders continued with this design for 10 years through everyones complaints about how badly it worked.
Drafty and with poor distribution of heat!
Running the fan 24/7 is the usual advise to make the heat distribution more even but it will never match todays expectations of comfort.
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Old 01-27-2012, 11:38 AM   #6
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Well I'm not sure this will work but if you slightly adjust the balancing dampers on the near furnace supplies and leave the farthest supplies wide open,you might see a slight improvement. The only way you can test this is with tempature readings.Professionals have meters to check air flo.
If the rooms you are concerned with are reaching the stat temp setting then you are good to go.
You will have to play with the balancing dampewrs until you get a good or close result.

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